my %self = %{$_[0]} if ref $_[0];

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has been deprecated and never really did what you think. See the end of Statement Modifiers in perlsyn about the behaviour or the lack of definedness.

In reply to Re: Should "use strict" complain if I use a variable that is not declared? by Corion
in thread Should "use strict" complain if I use a variable that is not declared? by earthman

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