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Validates the attribute is member of the given enumerable.

This validator has the same semantics as calling `Enum.member?/2`
with the given enumerable and value.

Nil values are not matched against (skipped).

## Options

* `:message` - defaults to "is not included in the list"

## Examples

    validate user,
      gender: member_of(~w(male female other))

    validate user,
      age: member_of(0..99)
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