[
  {
    "id": "$reduce baseline",
    "operator": "$reduce",
    "kind": "baseline",
    "operand": "all",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"3.0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce input: null",
    "operator": "$reduce",
    "kind": "null",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: missing",
    "operator": "$reduce",
    "kind": "missing",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: zero",
    "operator": "$reduce",
    "kind": "zero",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: negative",
    "operator": "$reduce",
    "kind": "negative",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: decimal",
    "operator": "$reduce",
    "kind": "decimal",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: numeric string",
    "operator": "$reduce",
    "kind": "numeric string",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: text",
    "operator": "$reduce",
    "kind": "text",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: empty string",
    "operator": "$reduce",
    "kind": "empty string",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: boolean",
    "operator": "$reduce",
    "kind": "boolean",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: false",
    "operator": "$reduce",
    "kind": "false",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: typed date",
    "operator": "$reduce",
    "kind": "typed date",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: decimal128",
    "operator": "$reduce",
    "kind": "decimal128",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: empty array",
    "operator": "$reduce",
    "kind": "empty array",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberInt\": \"0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce input: numeric array",
    "operator": "$reduce",
    "kind": "numeric array",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"6.0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce input: mixed array",
    "operator": "$reduce",
    "kind": "mixed array",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    }
  },
  {
    "id": "$reduce input: nested array",
    "operator": "$reduce",
    "kind": "nested array",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce input: empty object",
    "operator": "$reduce",
    "kind": "empty object",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: object",
    "operator": "$reduce",
    "kind": "object",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce input: ISO date string",
    "operator": "$reduce",
    "kind": "ISO date string",
    "operand": "input",
    "expression": {
      "$reduce": {
        "input": "$probe",
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce 'input' must resolve to an array"
    }
  },
  {
    "id": "$reduce initialValue: null",
    "operator": "$reduce",
    "kind": "null",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: missing",
    "operator": "$reduce",
    "kind": "missing",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: zero",
    "operator": "$reduce",
    "kind": "zero",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"3.0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: negative",
    "operator": "$reduce",
    "kind": "negative",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"1.0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: decimal",
    "operator": "$reduce",
    "kind": "decimal",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"5.5\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: numeric string",
    "operator": "$reduce",
    "kind": "numeric string",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: text",
    "operator": "$reduce",
    "kind": "text",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: empty string",
    "operator": "$reduce",
    "kind": "empty string",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: boolean",
    "operator": "$reduce",
    "kind": "boolean",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: false",
    "operator": "$reduce",
    "kind": "false",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: typed date",
    "operator": "$reduce",
    "kind": "typed date",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "bson": "{\"v\": {\"$date\": {\"$numberLong\": \"1768489200003\"}}}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: decimal128",
    "operator": "$reduce",
    "kind": "decimal128",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"4.25\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce initialValue: empty array",
    "operator": "$reduce",
    "kind": "empty array",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: numeric array",
    "operator": "$reduce",
    "kind": "numeric array",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: mixed array",
    "operator": "$reduce",
    "kind": "mixed array",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: nested array",
    "operator": "$reduce",
    "kind": "nested array",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: empty object",
    "operator": "$reduce",
    "kind": "empty object",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: object",
    "operator": "$reduce",
    "kind": "object",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce initialValue: ISO date string",
    "operator": "$reduce",
    "kind": "ISO date string",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": "$probe",
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$add only supports numeric types."
    }
  },
  {
    "id": "$reduce in: null",
    "operator": "$reduce",
    "kind": "null",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": null
    },
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    }
  },
  {
    "id": "$reduce in: missing",
    "operator": "$reduce",
    "kind": "missing",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": null}",
      "present": true
    }
  },
  {
    "id": "$reduce in: zero",
    "operator": "$reduce",
    "kind": "zero",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": 0
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberInt\": \"0\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: negative",
    "operator": "$reduce",
    "kind": "negative",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": -2
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberInt\": \"-2\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: decimal",
    "operator": "$reduce",
    "kind": "decimal",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": 2.5
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"2.5\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: numeric string",
    "operator": "$reduce",
    "kind": "numeric string",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": "12"
    },
    "srotax": {
      "bson": "{\"v\": \"12\"}",
      "present": true
    }
  },
  {
    "id": "$reduce in: text",
    "operator": "$reduce",
    "kind": "text",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": "hello"
    },
    "srotax": {
      "bson": "{\"v\": \"hello\"}",
      "present": true
    }
  },
  {
    "id": "$reduce in: empty string",
    "operator": "$reduce",
    "kind": "empty string",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": ""
    },
    "srotax": {
      "bson": "{\"v\": \"\"}",
      "present": true
    }
  },
  {
    "id": "$reduce in: boolean",
    "operator": "$reduce",
    "kind": "boolean",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": true
    },
    "srotax": {
      "bson": "{\"v\": true}",
      "present": true
    }
  },
  {
    "id": "$reduce in: false",
    "operator": "$reduce",
    "kind": "false",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": false
    },
    "srotax": {
      "bson": "{\"v\": false}",
      "present": true
    }
  },
  {
    "id": "$reduce in: typed date",
    "operator": "$reduce",
    "kind": "typed date",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": {
        "$date": "2026-01-15T15:00:00Z"
      }
    },
    "srotax": {
      "bson": "{\"v\": {\"$date\": {\"$numberLong\": \"1768489200000\"}}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: decimal128",
    "operator": "$reduce",
    "kind": "decimal128",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": {
        "$numberDecimal": "1.25"
      }
    },
    "srotax": {
      "bson": "{\"v\": {\"$numberDecimal\": \"1.25\"}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: empty array",
    "operator": "$reduce",
    "kind": "empty array",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": []
    },
    "srotax": {
      "bson": "{\"v\": []}",
      "present": true
    }
  },
  {
    "id": "$reduce in: numeric array",
    "operator": "$reduce",
    "kind": "numeric array",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": [
        1,
        2,
        3
      ]
    },
    "srotax": {
      "bson": "{\"v\": [{\"$numberInt\": \"1\"}, {\"$numberInt\": \"2\"}, {\"$numberInt\": \"3\"}]}",
      "present": true
    }
  },
  {
    "id": "$reduce in: mixed array",
    "operator": "$reduce",
    "kind": "mixed array",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": [
        1,
        null,
        "x",
        3
      ]
    },
    "srotax": {
      "bson": "{\"v\": [{\"$numberInt\": \"1\"}, null, \"x\", {\"$numberInt\": \"3\"}]}",
      "present": true
    }
  },
  {
    "id": "$reduce in: nested array",
    "operator": "$reduce",
    "kind": "nested array",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": [
        [
          1,
          2
        ],
        [
          3
        ]
      ]
    },
    "srotax": {
      "bson": "{\"v\": [[{\"$numberInt\": \"1\"}, {\"$numberInt\": \"2\"}], [{\"$numberInt\": \"3\"}]]}",
      "present": true
    }
  },
  {
    "id": "$reduce in: empty object",
    "operator": "$reduce",
    "kind": "empty object",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": {}
    },
    "srotax": {
      "bson": "{\"v\": {}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: object",
    "operator": "$reduce",
    "kind": "object",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": {
        "x": 1
      }
    },
    "srotax": {
      "bson": "{\"v\": {\"x\": {\"$numberInt\": \"1\"}}}",
      "present": true
    }
  },
  {
    "id": "$reduce in: ISO date string",
    "operator": "$reduce",
    "kind": "ISO date string",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0,
        "in": "$probe"
      }
    },
    "input": {
      "probe": "2026-01-15T15:00:00Z"
    },
    "srotax": {
      "bson": "{\"v\": \"2026-01-15T15:00:00Z\"}",
      "present": true
    }
  },
  {
    "id": "$reduce omit input",
    "operator": "$reduce",
    "kind": "omitted named argument",
    "operand": "input",
    "expression": {
      "$reduce": {
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce requires 'input', 'initialValue', and 'in' fields"
    }
  },
  {
    "id": "$reduce omit initialValue",
    "operator": "$reduce",
    "kind": "omitted named argument",
    "operand": "initialValue",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce requires 'input', 'initialValue', and 'in' fields"
    }
  },
  {
    "id": "$reduce omit in",
    "operator": "$reduce",
    "kind": "omitted named argument",
    "operand": "in",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2
        ],
        "initialValue": 0
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce requires 'input', 'initialValue', and 'in' fields"
    }
  },
  {
    "id": "$reduce empty arguments",
    "operator": "$reduce",
    "kind": "empty arguments",
    "operand": "all",
    "expression": {
      "$reduce": []
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce expects an object with fields: input, initialValue, in"
    }
  },
  {
    "id": "$reduce unknown option",
    "operator": "$reduce",
    "kind": "unknown option",
    "operand": "all",
    "expression": {
      "$reduce": {
        "unexpected": 1
      }
    },
    "input": {},
    "srotax": {
      "error": "IllegalArgumentException",
      "message": "$reduce requires 'input', 'initialValue', and 'in' fields"
    }
  },
  {
    "id": "mongodb-9-boundary-cases.json:12",
    "operator": "$reduce",
    "kind": "boundary example",
    "operand": "all",
    "expression": {
      "$reduce": {
        "input": [
          1,
          2,
          3
        ],
        "initialValue": 0,
        "in": {
          "$add": [
            "$$value",
            "$$this"
          ]
        }
      }
    },
    "input": {},
    "srotax": {
      "bson": "{\"v\": {\"$numberDouble\": \"6.0\"}}",
      "present": true
    }
  }
]