All strings in the Perl programming language are unicode text strings, and all streams produce those, so what exactly do you mean by "unicode text streams"? You probably meant something like "use only read, readline, print on streams marked (using binmode, open etc.) with utf-8".

Apologies, yes, that's what I meant. Please also see my comments today in reply to Anonymous Monk

Tommy
A mistake can be valuable or costly, depending on how faithfully you pursue correction

In reply to Re^2: UTF-8 and systemIO are not friends anymore by Tommy
in thread UTF-8 and systemIO are not friends anymore by Tommy

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