Maybe[...] doesn't work with coercion (wontfix), but ...|Undef does (although it was buggy before 1.11).

In reply to Re^3: MooseX::Declare and undef attributes - MooseX::UndefTolerant not working by ikegami
in thread MooseX::Declare and undef attributes - MooseX::UndefTolerant not working by err

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