[darcs-users] darcs patch: fpstring.c: switch a memchr for memrchr (and 2 more)

[gwern0 at gmail.com]

Fri Apr 25 16:01:53 EDT 2008  gwern0 at gmail.com
  * fpstring.c: switch a memchr for memrchr
  See <http://bugs.darcs.net/issue814>; memrchr speeds up is_funky quite a bit and thus helps whatsnew -s. It doesn't seem to break (any more) tests.

Sun Apr 27 19:39:47 EDT 2008  gwern0 at gmail.com
  * Diff.lhs: has_bin only inspects first 4096 characters
  This is an optimization for large files, it saves running has_funky on gigs and gigs of data when pretty much all binary files give the truth away within a few characters.

Sun Apr 27 19:41:09 EDT 2008  gwern0 at gmail.com
  * Diff.lhs, Prefs.lhs: add docs for 4096 optimization
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