Try this: 
perl -e 'my $x = 10; $x = "2" . $x; print $x + 0'

[download]
With 5.6.0 this prints 10.

There are many other things wrong with 5.6.0, but this one is generally good enough to make the point.

In reply to Re (tilly) 2: on 5.5.3, waiting for 5.6.1 (was Re: Re: Adding or removing keys while iterating over a hash) by tilly
in thread Adding or removing keys while iterating over a hash by mischief

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