Please consider using the cleaner perl5.10 variant //= if you expect $some_ref->{id} to be nonexistent / not defined. $some_href->{id} //= 0 This makes it explicit that you only want to set id when it was not defined before. Then the truthy, falsy nature of '', 0 and other variants is no longer of concern.
print+qq(\L@{[ref\&@]}@{['@'x7^'!#2/"!4']});

In reply to Re^3: What is the difference between |= and ||=? by codeacrobat
in thread What is the difference between |= and ||=? by Anonymous Monk

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