It would be useful if you could provide a small, self-contained script exhibiting the problem.

The "type of argument to keys on reference" error message comes from doing keys($blessed_object). I can't see anywhere in MooseX::UndefTolerant that does this. (Or indeed anywhere where it uses keys() at all!)

Are you sure that it's the created_date attribute which is causing the issue? Might it be something else?

use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name

In reply to Re: Attribute does not pass Type Constraint by tobyink
in thread Attribute does not pass Type Constraint by PerlSufi

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