[activesupport] More accurate type for #try #181
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This PR improves
trymethod types.Note that the type definition of
NilClass#tryis more strict than the implementation.nil.tryraises no error but the type definition rejects it.I think the strict behavior is better because it is the same behavior as
ActiveSupport::Tryable#try. Usuallytry's receiver is an optional value, so these interface should be the same.