Martin von Zweigbergk <martinvonz@google.com> [Wed, 15 Mar 2017 09:30:50 -0700] rev 31424
py3: optimize py3 compat.bytechr using Struct.pack
With Python 3.4.3, timeit says 0.437 usec -> 0.0685 usec. With Python
3.6, timeit says 0.157 usec -> 0.0907 usec. So it's faster on both
versions, but the speedup varies a lot.
Thanks to Gregory Szorc for the suggestion.