Re^2: How to get Keys from hash having same value?

Or, to avoid the extra hash lookups, iterate over key-value pairs using each.

my @as = ();
while (my ($key, $value) = each %myhash){
   push @as, $key if $value eq 'a';
}
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Update:

Is there a monk among us who can shorten this into a one-liner, similar to the grep keys examples we have seen?

It seems that each does not combine nicely with grep, map and their ilk.