@spec implements!(any(), module()) :: any()

Returns x or raises if x does not implment protocol.

iex> Moar.Protocol.implements!(~D[2000-01-02], String.Chars)
~D[2000-01-02]

@spec implements?(any(), module()) :: boolean()

Returns true if x implements protocol.

iex> Moar.Protocol.implements?(~D[2000-01-02], String.Chars)
true