We strongly recommend that you use strictures (use strict; use warnings;) for all your Perl scripts.

The fat comma => makes it a lot easier to check that initialization lists for hashes are correct. Consider:

my %some_hash = (
    foo   => 35,
    bar   => 12.4,
    2.5   => "hello",
    wilma => 1.72e30,
    betty => "bye\n"
    );
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