[Python-3000] Lines breaking

[Stephen J. Turnbull]

Jim Jewett writes:

 > Even then, I don't think we *need* to do it.  Unicode generally allows
 > tailoring (so long as you specify), and the entirety of chapter 5
 > (Implementation Guidelines) is explicitly non-normative.

"Non-normative" in this case means you can claim Unicode conformance
without conforming to UAX#14.  However, that means we have to deny
that we conform to UAX#14.  If we want to claim conformance, we have
no choice about FORM FEED; the "bk" class is not tailorable and
"support" for FORM FEED is not optional. :-(  (I don't understand why
they did that; to me Bill's example is compelling.)

 > That said, it might be a sensible change anyhow, particularly if we
 > treat it like the CRLF combination, so that a Form Feed at the the end
 > of a line doesn't force splitlines to produce an empty line.

I don't think that's conformant, but it might be a good enough
compromise to be conformant*<wink>, and is Pythonic (ie, similar to CRLF).