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In a child process, raising SystemExit or calling sys.exit with a non-integer, non-string argument value causes a TypeError at Lib/multiprocessing/process.py :: _bootstrap. This is from concatenating the argument with '\n' and writing it to stderr.
Suggested fix: replace
 sys.stderr.write(e.args[0] + '\n')
with
 sys.stderr.write(str(e.args[0]) + '\n')
This problem also occurs when the value is None, but only for raising SystemExit (not calling sys.exit()).

Also, as Brett pointed out to me in #13853, bool is a subclass of int, so they should follow the same code path. I suggest replacing
 elif type(e.args[0]) is int:
 exitcode = e.args[0]
with something like
 elif isinstance(e.args[0], int):
 exitcode = e.args[0]
which assumes that a subtype of int is convertible to int.

New changeset 4346cba353b4 by Richard Oudkerk in branch '3.2':
Issue #13854: Properly handle non-integer, non-string arg to SystemExit
http://hg.python.org/cpython/rev/4346cba353b4
New changeset 3585cb1388f2 by Richard Oudkerk in branch 'default':
Merge fixes for #13854 and #12157.
http://hg.python.org/cpython/rev/3585cb1388f2
New changeset da5b370f41a1 by Richard Oudkerk in branch '2.7':
Issue #13854: Properly handle non-integer, non-string arg to SystemExit
http://hg.python.org/cpython/rev/da5b370f41a1