Re: [PATCH 4/5] config.c: add a "tristate" helper

Jeff King [off-list ref] writes:

So a function like:

  int git_parse_tristate(const char *value, int *out);

which returned success/error via its return value, and put the value
into "out" would feel pretty natural to me.

Yeah, with s/tristate/bool-or-auto/, and if we do this throughout
the types, that would be ideal.  FWIW git_parse_ulong() and friends
for sized numerics already follow that pattern, but helpers for
boolean like git_parse_maybe_bool() don't, which is unfortunate.