Hello, fellow monks!
I'm seeing strange things going on with my hash keys.
#! /usr/bin/perl
use strict;
use warnings;
use utf8;
sub U { return utf8::is_utf8($_[0])?'is_utf8':'not_utf8'; }
my %s = (
MaxAccountSize1 => 1,
'MaxAccountSize2' => 1,
2 => 1,
);
foreach (sort keys %s) {
print "'$_' ".U($_)." => '".$s{$_}."' ".U($s{$_})."\n";
}
It looks like in presence of
use utf8 hash keys upgraded from barewords via virtues of
=> operator get the utf8 flag. Quoted string literals on the contrary get this flag on if they contain characters with high codes -- in full accordance with the docs. It cost us a lot of blood and sweat to debug why some perfectly ASCII strings would suddenly get the flag.
Is there any rationale in such decision? Is it a bug? Does anyone know what the performance penalty of utf8 hash keys -- even if they contain only ASCII chars -- is?