Under

use strict;
use warnings;
my $foo = undef;

the expressions

$foo . ''

and

"$foo"

both produce

Use of uninitialized value $foo in ... at ...

but the following expression gives the empty string without warning:

$foo x 1

Anyone knows why? I mean, it's cool to have a nice stringification idiom ($_ x 1 is quite much shorter than defined ? "$_" : ''), but it feels a bit weird.

perl warnings undef
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