The same thing tobyink and tye said, though more obtusely and snarkily.
Here's another example:
tie my $var, 'Some::BlackBox::Module';
$var = "45";
if ( $var ) { print "var is true\n" } # doesn't print! WTF?
The mere fact that an expression evaluates to a true value in scalar context doesn't mean it is true.
tie and overload are among the user-accessible features which can muddy the true/false waters.
An example like this should make the principle more obvious:
my $obj = ObjectWithLotsOfOpaqueStructure::AndLotsOfHiddenState->new(
-use_overloading => 1,
);
if ( $obj ) {
print "obj is 'true'.\n";
# What does this even mean?
# Maybe obj is an iterator with another available item?
}
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