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perl -MO=Deparse -e "$h{512_x64} = 10; print $h{512_x64}, qq/\n/;"

x</x> operator stringifies it, so that the number 512 is stringified a
+nd repeated 64 times.</p>
<p>In your definition (ie, <c>%h = ( 512_x64 => 'value' );