{
  "expression": [
    "boolean",
    ["in", ["get", "substr"], ["get", "str"]]
  ],
  "inputs": [
    [{}, {"properties": {"substr": null, "str": "helloworld"}}],
    [{}, {"properties": {"substr": "foo", "str": "helloworld"}}],
    [{}, {"properties": {"substr": "low", "str": "helloworld"}}],
    [{}, {"properties": {"substr": true, "str": "falsetrue"}}],
    [{}, {"properties": {"substr": false, "str": "falsetrue"}}],
    [{}, {"properties": {"substr": 123, "str": "hello123world"}}],
    [{}, {"properties": {"substr": "low", "str": null}}]
  ],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "boolean"
    },
    "outputs": [
      false,
      false,
      true,
      true,
      true,
      true,
      false
    ],
    "serialized": [
      "boolean",
      ["in", ["get", "substr"], ["get", "str"]]
    ]
  }
}