Should Any#contains? be Any::includes?

[HCLarsen]

There's a method in Any called contains?, and it's essentially a wrapper for the includes? method if the underlying value is an Array or String. Replacing it with a method called includes? would make this far more consistent with the core library.

It also returns a false value if the underlying object isn't an Array or String. Is this the best behaviour, or should it raise an exception in this situation?