I don't know what you mean by "unicode encoding" (are there encodings that map to non-unicode chars?), but in the perl context it's worth mentioning that iso-8859-1 strings don't follow unicode-semantics by default, the need to be encoded like any other string
It is a unicode encoding, in that after you've decoded the character number, the number maps 1-on-1 to the Unicode space. Don't forget that UTF-8 is just a way of encoding a sequence *numbers*.
That non-SvUTF8-flagged strings get ASCII semantics in some places, is indeed by design, but that wasn't sufficiently thought through IMO. Note that these strings may get unicode semantics in some circumstances, and ascii semantics in others. The ascii semantics are for charclass and upper-/lower case stuff.
I consider this a bug in Perl. See also Unicode::Semantics, and expect the bug to be fixed in 5.12.
And I really like the Perl 6 spec which allows string operations on byte, codepoint and grapheme level ;-)
Just realise that Unicode strings don't have a byte level :)
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