greatroar 3e032c4da6 lib/fs: optimize Windows path checking/sanitizing
name                          old time/op    new time/op    delta
WindowsInvalidFilenameValid-8     875ns ± 1%     150ns ± 1%  -82.84%  (p=0.000 n=9+9)
WindowsInvalidFilenameNUL-8       276ns ± 4%     121ns ± 3%  -56.26%  (p=0.000 n=10+10)

name                          old alloc/op   new alloc/op   delta
WindowsInvalidFilenameValid-8     32.0B ± 0%     16.0B ± 0%  -50.00%  (p=0.000 n=10+10)
WindowsInvalidFilenameNUL-8       32.0B ± 0%     19.0B ± 0%  -40.62%  (p=0.000 n=10+10)

name                          old allocs/op  new allocs/op  delta
WindowsInvalidFilenameValid-8      2.00 ± 0%      1.00 ± 0%  -50.00%  (p=0.000 n=10+10)
WindowsInvalidFilenameNUL-8        2.00 ± 0%      2.00 ± 0%     ~     (all equal)
2021-11-23 21:25:29 +01:00
..
2021-09-26 12:15:39 +02:00