Answering to first your question about "polymorphic code" - I see the only way how to read this.
Perl *always* produces polymorphic opcode and whether currently unicode features are in effect on a given regular expression depends on "utf8" switch.

Courage, the Cowardly Dog

In reply to Re: Unicode, regex's, encodings, and all that (Perl 5.6 and 5.8) by Courage
in thread Unicode, regex's, encodings, and all that (Perl 5.6 and 5.8) by John M. Dlugosz

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