One very simple approach that works with older versions of Perl is to use lexical variables for your keys.

use strict;

my $bar = 'bar';

my $foo{$bar} = 1;
my $foo{$bear} = 1; # gives a compile error

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In reply to Re: how to avoid mis-spelling hash keys? by perrin
in thread how to avoid mis-spelling hash keys? by Gorilla

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