util: call warnings.warn() with a sysstr in nouideprecwarn This preserves nouideprecwarn wanting a bytes, which is consistent with the rest of hg. Differential Revision: https://phab.mercurial-scm.org/D2210

ui: convert stack traces to sysbytes before logging They're coming back as unicodes, so sysbytes seems like the best we can do. This is like D2171 and D2172, but those fail on Python 2.7.5 (seriously!), so this is my version of the same change. I actually wrote this before reviewing those, then discarded it, then came back to it after finding out 2.7.5 is a silly place. Differential Revision: https://phab.mercurial-scm.org/D2209

ui: use pycompat.bytestr() to get a bytes-repr of config default We don't know what type we'll get here, so we need something that'll behave like a repr without returning a unicode. Differential Revision: https://phab.mercurial-scm.org/D2208

tests: add tons of b prefixes in test-devel-warnings.t # skip-blame because it's just b prefixes Differential Revision: https://phab.mercurial-scm.org/D2207

py3: convert traceback representation to bytes when logging Python's APIs should return a system string. We want to use bytes for logging. So convert the traceback to bytes before sending it to the logger. Differential Revision: https://phab.mercurial-scm.org/D2176

py3: convert context to bytes instead of str This yields identical behavior on Python 2 and 3. Differential Revision: https://phab.mercurial-scm.org/D2174

py3: add missing b'' literal to sshprotoext.py Everywhere else in this file uses b''. I must have missed a line when I wrote this code a few days ago. # skip-blame b prefix Differential Revision: https://phab.mercurial-scm.org/D2173

py3: make dummyssh compatible with Python 3 Required encoding a str to bytes and writing bytes to a file descriptor. Differential Revision: https://phab.mercurial-scm.org/D2170