Here's my shot at doing it in a single step — but don't try this at home.

%hash = (
    0 .. keys( %hash ) - 1, @hash{ sort { $a <=> $b } keys %hash }
)[ map +( $_, $_ + keys %hash ), 0 .. keys( %hash ) - 1 ];

[download]

Makeshifts last the longest.

In reply to Re: re-key a hash by Aristotle
in thread re-key a hash by Anonymous Monk

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