Array and object `search` in "contains"

[Eswcvlad]

In the current version the following expressions do not throw a TypeError and return an odd result:

• contains([1, `[2]`, 3], `[2]`) -> false
• contains([1, {a: 1}, 3], {a: 1}) -> false

Seems like a valid use case tbh.

[JohnBrinkman]

Documentation says the second parameter must be one of: string|boolean|number|null, but the implementation allows any. We can fix this by either changing the documentation to be more premissive, or the implementation to be more strict...