[1.8.0] Add Kind.of.<Type>.{as_maybe,as_optional} #22
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Closes #20
Add Kind.of.<Type>.{as_maybe,as_optional}
as_maybe
/as_optional
must returns a lambda if it was called without an argument.Kind::Maybe#try
to receive the expected method arguments.Kind.of.<Type>#instance?
to returns a lambda if it was called without an argument.