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%YAML 1.2
---
scalar_functions:
  -
    name: "is_in"
    description: >
      Checks membership of a value in a list of values

      Returns true or false if `needle` is found in `haystack`.
    impls:
      - args:
        - name: needle
          value: any1
        - name: haystack
          value: list<any1>
        options:
          nan_equality:
            values: [ NAN_IS_NAN, NAN_IS_NOT_NAN ]
        return: "boolean"
