Gallopsled/pwntools — pull request #255 by zachriggle (2014-12-27 00:43:04+00:00)
Title: Update Timeout semantics to

Use None to imply "never", and to use a sentinel object for default timeouts

Addresses #251

This again has a big performance hit, so I'll defer to @br0ns for recommendations. I assume that it's the use of sentinel objects that are looked up rather than constants