[Chicago] is there really no built-in file/iter split() thing?

[skip at pobox.com]

    Skip> Patch here:
    Skip> http://bugs.python.org/issue1538

    David> And who says these micro-optimization threads don't lead to
    David> useful output?

Note that this particular optimization (avoiding the copy when r?split
matches nothing) is a very micro optimization itself.  It may well get
rejected as not worth the extra complexity.

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