[
  {
    "id": "$function baseline",
    "operator": "$function",
    "kind": "baseline",
    "operand": "all",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": {\"$numberInt\": \"2\"}}",
      "present": true
    },
    "mongo": {
      "bson": "{\"v\": {\"$numberDouble\": \"2.0\"}}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function body: null",
    "operator": "$function",
    "kind": "null",
    "operand": "body",
    "expression": {
      "$function": {
        "body": null,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: zero",
    "operator": "$function",
    "kind": "zero",
    "operand": "body",
    "expression": {
      "$function": {
        "body": 0,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: negative",
    "operator": "$function",
    "kind": "negative",
    "operand": "body",
    "expression": {
      "$function": {
        "body": -2,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: decimal",
    "operator": "$function",
    "kind": "decimal",
    "operand": "body",
    "expression": {
      "$function": {
        "body": 2.5,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: numeric string",
    "operator": "$function",
    "kind": "numeric string",
    "operand": "body",
    "expression": {
      "$function": {
        "body": "12",
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "RuntimeException",
      "message": "JavaScript function execution failed"
    },
    "mongo": {
      "bson": "{\"v\": {\"$numberDouble\": \"12.0\"}}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function body: text",
    "operator": "$function",
    "kind": "text",
    "operand": "body",
    "expression": {
      "$function": {
        "body": "hello",
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "RuntimeException",
      "message": "JavaScript function execution failed"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: Failed to invoke JS function :: function id = 1: e-runtime message : 'hello is not defined', file : 'wasm:function', line : 1, column : 15\n@wasm:function:1:15\n",
      "code": 139,
      "error": "JSInterpreterFailure"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: empty string",
    "operator": "$function",
    "kind": "empty string",
    "operand": "body",
    "expression": {
      "$function": {
        "body": "",
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "RuntimeException",
      "message": "JavaScript function execution failed"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: Failed to create JS function :: source = : ok message : 'none', file : 'none', line : 0, column : 0",
      "code": 139,
      "error": "JSInterpreterFailure"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: boolean",
    "operator": "$function",
    "kind": "boolean",
    "operand": "body",
    "expression": {
      "$function": {
        "body": true,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: false",
    "operator": "$function",
    "kind": "false",
    "operand": "body",
    "expression": {
      "$function": {
        "body": false,
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: typed date",
    "operator": "$function",
    "kind": "typed date",
    "operand": "body",
    "expression": {
      "$function": {
        "body": {
          "$date": "2026-01-15T15:00:00Z"
        },
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: decimal128",
    "operator": "$function",
    "kind": "decimal128",
    "operand": "body",
    "expression": {
      "$function": {
        "body": {
          "$numberDecimal": "1.25"
        },
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: empty array",
    "operator": "$function",
    "kind": "empty array",
    "operand": "body",
    "expression": {
      "$function": {
        "body": [],
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be a constant expression",
      "code": 31432,
      "error": "Location31432"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: numeric array",
    "operator": "$function",
    "kind": "numeric array",
    "operand": "body",
    "expression": {
      "$function": {
        "body": [
          1,
          2,
          3
        ],
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be a constant expression",
      "code": 31432,
      "error": "Location31432"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: mixed array",
    "operator": "$function",
    "kind": "mixed array",
    "operand": "body",
    "expression": {
      "$function": {
        "body": [
          1,
          null,
          "x",
          3
        ],
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be a constant expression",
      "code": 31432,
      "error": "Location31432"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: nested array",
    "operator": "$function",
    "kind": "nested array",
    "operand": "body",
    "expression": {
      "$function": {
        "body": [
          [
            1,
            2
          ],
          [
            3
          ]
        ],
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be a constant expression",
      "code": 31432,
      "error": "Location31432"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: empty object",
    "operator": "$function",
    "kind": "empty object",
    "operand": "body",
    "expression": {
      "$function": {
        "body": {},
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must evaluate to type string or code",
      "code": 31262,
      "error": "Location31262"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: object",
    "operator": "$function",
    "kind": "object",
    "operand": "body",
    "expression": {
      "$function": {
        "body": {
          "x": 1
        },
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be a constant expression",
      "code": 31432,
      "error": "Location31432"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function body: ISO date string",
    "operator": "$function",
    "kind": "ISO date string",
    "operand": "body",
    "expression": {
      "$function": {
        "body": "2026-01-15T15:00:00Z",
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "RuntimeException",
      "message": "JavaScript function execution failed"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: Failed to create JS function :: source = 2026-01-15T15:00:00Z: e-compile message : 'identifier starts immediately after numeric literal', file : 'common:parseHelper', line : 18, column : 34\nvalue@common:parseHelper:18:34\n",
      "code": 139,
      "error": "JSInterpreterFailure"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: null",
    "operator": "$function",
    "kind": "null",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: missing",
    "operator": "$function",
    "kind": "missing",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: zero",
    "operator": "$function",
    "kind": "zero",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: negative",
    "operator": "$function",
    "kind": "negative",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: decimal",
    "operator": "$function",
    "kind": "decimal",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: numeric string",
    "operator": "$function",
    "kind": "numeric string",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: text",
    "operator": "$function",
    "kind": "text",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: empty string",
    "operator": "$function",
    "kind": "empty string",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: boolean",
    "operator": "$function",
    "kind": "boolean",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: false",
    "operator": "$function",
    "kind": "false",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: typed date",
    "operator": "$function",
    "kind": "typed date",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: decimal128",
    "operator": "$function",
    "kind": "decimal128",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: empty array",
    "operator": "$function",
    "kind": "empty array",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "bson": "{\"v\": {\"$numberDouble\": \"NaN\"}}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function args: numeric array",
    "operator": "$function",
    "kind": "numeric array",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "bson": "{\"v\": {\"$numberDouble\": \"2.0\"}}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function args: mixed array",
    "operator": "$function",
    "kind": "mixed array",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "bson": "{\"v\": {\"$numberDouble\": \"2.0\"}}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function args: nested array",
    "operator": "$function",
    "kind": "nested array",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "bson": "{\"v\": \"1,21\"}",
      "present": true
    },
    "status": "DIFFERENCE"
  },
  {
    "id": "$function args: empty object",
    "operator": "$function",
    "kind": "empty object",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: object",
    "operator": "$function",
    "kind": "object",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function args: ISO date string",
    "operator": "$function",
    "kind": "ISO date string",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": "$probe",
        "lang": "js"
      }
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Executor error during aggregate command on namespace: fluxion_operator_parity_disposable.$cmd.aggregate :: caused by :: The args field must be of type array",
      "code": 31266,
      "error": "Location31266"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: null",
    "operator": "$function",
    "kind": "null",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": null
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: zero",
    "operator": "$function",
    "kind": "zero",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": 0
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: negative",
    "operator": "$function",
    "kind": "negative",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": -2
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: decimal",
    "operator": "$function",
    "kind": "decimal",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": 2.5
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: numeric string",
    "operator": "$function",
    "kind": "numeric string",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": "12"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: text",
    "operator": "$function",
    "kind": "text",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": "hello"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: empty string",
    "operator": "$function",
    "kind": "empty string",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": ""
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: boolean",
    "operator": "$function",
    "kind": "boolean",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": true
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: false",
    "operator": "$function",
    "kind": "false",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": false
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: typed date",
    "operator": "$function",
    "kind": "typed date",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": {
          "$date": "2026-01-15T15:00:00Z"
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: decimal128",
    "operator": "$function",
    "kind": "decimal128",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": {
          "$numberDecimal": "1.25"
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: empty array",
    "operator": "$function",
    "kind": "empty array",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": []
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: numeric array",
    "operator": "$function",
    "kind": "numeric array",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": [
          1,
          2,
          3
        ]
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: mixed array",
    "operator": "$function",
    "kind": "mixed array",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": [
          1,
          null,
          "x",
          3
        ]
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: nested array",
    "operator": "$function",
    "kind": "nested array",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": [
          [
            1,
            2
          ],
          [
            3
          ]
        ]
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: empty object",
    "operator": "$function",
    "kind": "empty object",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": {}
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: object",
    "operator": "$function",
    "kind": "object",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": {
          "x": 1
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function lang: ISO date string",
    "operator": "$function",
    "kind": "ISO date string",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ],
        "lang": "2026-01-15T15:00:00Z"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: Currently the only supported language specifier is 'js'.",
      "code": 31419,
      "error": "Location31419"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function omit body",
    "operator": "$function",
    "kind": "omitted named argument",
    "operand": "body",
    "expression": {
      "$function": {
        "args": [
          1
        ],
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'body' must be a JavaScript function body"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be specified.",
      "code": 31261,
      "error": "Location31261"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function omit args",
    "operator": "$function",
    "kind": "omitted named argument",
    "operand": "args",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "lang": "js"
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'args' must be an array"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The args field must be specified.",
      "code": 31263,
      "error": "Location31263"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function omit lang",
    "operator": "$function",
    "kind": "omitted named argument",
    "operand": "lang",
    "expression": {
      "$function": {
        "body": "function(a) { return a + 1; }",
        "args": [
          1
        ]
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The lang field must be specified.",
      "code": 31418,
      "error": "Location31418"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function empty arguments",
    "operator": "$function",
    "kind": "empty arguments",
    "operand": "all",
    "expression": {
      "$function": []
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function expects a document with 'body', 'args', and 'lang'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: $function requires an object as an argument, found: array",
      "code": 31260,
      "error": "Location31260"
    },
    "status": "BOTH_REJECTED"
  },
  {
    "id": "$function unknown option",
    "operator": "$function",
    "kind": "unknown option",
    "operand": "all",
    "expression": {
      "$function": {
        "unexpected": 1
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$function 'lang' must be specified and set to 'js'"
    },
    "mongo": {
      "message": "Invalid $project :: caused by :: The body function must be specified.",
      "code": 31261,
      "error": "Location31261"
    },
    "status": "BOTH_REJECTED"
  }
]