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A few thoughts:

Those isX() methods belong in Scalar::Util (or something similar). I have similar snippets in DBM::Deep itself for the exact same reason.
You need to localize $SIG{__DIE__} within those evals. In doing this for DBM::Deep, I found Test::More does things with die handlers that get tripped up with this.

My criteria for good software:

Does it work?
Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re^6: Is this DBM::Deep behavior, or something with tie/bless? (ref) by dragonchild
in thread Is this DBM::Deep behavior, or something with tie/bless? by romandas

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