Fair enough++, so you have my apologies if my tone sounded too arrogant. One important point about Perl 5 though, is that it does not have a real spec: it is defined by its own implementation. This is an inconvenience that the Perl 6 crowd are trying to correct. OTOH I'm quite sure that evaluation order is from left to right and was about to paste here the paragraph in perldoc perlsyn saying so. Unfortunately simple searches can't seem to find it and I don't know if it's there at all... and I don't know where else it may be.
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