Same approach you took, but clearer and faster: 

use Sort::Key qw( ikeysort );

my @sorted = ikeysort { $order{ fc( $_ ) } } @unsorted;

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In reply to Re: Challenge: sort weekdays in week-order (elegantly and efficiently) by ikegami
in thread Challenge: sort weekdays in week-order (elegantly and efficiently) by bliako

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