I don't know if perl's documentation defines (as a feature) the order in which arguments are evaluated

It's not, but no one has mentioned a system or version where the arguments are evaluated in any order other than left-to-right in past discussions on the subject.

It's technically subject to change since it's not documented, but I find it highly unlikely to change in Perl5.

In reply to Re^3: Puzzling $| behavior by ikegami
in thread Puzzling $| behavior by saintmike

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