! Aware to Perl: What happens if I add or remove keys from a hash while iterating over it?

What happens if I add or remove keys from a hash while iterating over it?

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Don't do that.

Source: Perl FAQ: Data Manipulation
Copyright: Copyright (c) 1997 Tom Christiansen and Nathan Torkington.

(Corrections, notes, and links courtesy of RocketAware.com)

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