I really meant to use reverse. According to Perl::Critic::Policy::BuiltinFunctions::ProhibitReverseSortBlock
Conway says that it is much clearer to use reverse than to flip $a and $b around in a sort block. He also suggests that, in newer perls, reverse is specifically looked for and optimized, and in the case of a simple reversed string sort, using reverse with a sort with no block is faster even in old perls.

In reply to Re^3: Sort Hash of Hash numerically by toolic
in thread Sort Hash of Hash numerically by PerlUsr173

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