ruff
[ty] Lazily initialize `UnionBuilder` when transforming a union type
#24929

Merged

[ty] Lazily initialize `UnionBuilder` when transforming a union type #24929

charliermarsh merged 9 commits into astral-sh:main from mtshiba:identity-preservation

[ty] don't use `UnionBuilder` if the elements of the union have not b…

c0c93a7a

mtshiba added performance

mtshiba added ty

MichaReiser commented on 2026-04-29

lazily initialize `UnionBuilder`

3ffb2a7e

do the same thing for intersection

402fcfbd

Revert "do the same thing for intersection"

1d3bad6e

mtshiba changed the title ~~[ty] don't use `UnionBuilder` if the elements of the union have not been changed by a transformation~~ [ty] Lazily initialize `UnionBuilder` when transforming a union type 30 days ago

mtshiba marked this pull request as ready for review 30 days ago