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This PR has one question on the code directly (but nothing to actually merge, just start discussion).
Aside from that:
You can specify a non-sub for @Has attributes:
This will crash at runtime with a not-a-code-reference. Would it be possible/better to do this check at compile time (unitcheck?) when finalizing the class to make sure attributes are properly formed?
Also, $IS_ABSTRACT/$IS_CLOSED are writeable after the class has been compiled, should this be
locked somehow? Deleting/modifying %HAS also modifies closed objects after they are supposed to have a consistent state. Is this acceptable/intentional?
One final thing, ->new() doesn't check for invalid parameters being passed to the constructor. Should it? Or is that up to a sugar layer?