Reported in https://github.com/ghostty-org/ghostty/discussions/14064
I validated this myself manually. The zero-ref branch of
`addWithIdContext` incremented `living` unconditionally even if `upsert`
resolved the value to an item that was already alive under a different
ID.
This would cause `living` to be invalid for each time this happened and
the downstream effect was that `count()` drifted. I couldn't find any
crashing or invalid effect except that this caused requested style
memory to be over-provisioned.
cc @qwerasd205 since its ref counted set, but I did this work manually
❤️
c2906398be