PR #12558 was heavy for what the fix actually is — essay-length
comments, a dedicated helper method where a setdefault would do, and
a source-inspection test with no real behavior coverage. The
genuine code change is ~5 lines of new logic (1 field, 2 async with,
an on_ready wait block).
Trimmed:
- Replaced the 12-line _voice_lock_for helper with a setdefault
one-liner at each call site (join_voice_channel, leave_voice_channel).
- Collapsed the 12-line comment on on_message's _ready_event wait to
3 lines. Dropped the warning log on timeout — pass-on-timeout is
fine; if on_ready hangs that long, the bot is already broken and
the log wouldn't help.
- Dropped the source-inspection test (greps the module source for
expected substrings). It was low-value scaffolding; the
voice-serialization test covers actual behavior.
Net: -73 lines vs PR #12558. Same two guarantees preserved, same
test passes (verified by stashing the fix and confirming failure).