Both sides of every detected collision. Lets callers distinguish benign
cross-file collisions in CodeGen's +100000 staging zone (sequences are
renumbered by spUpdateExistingEntityFieldsFromSchema between migrations,
so the same staged value recurring in a LATER migration never collides at
runtime) from real same-file or real-sequence collisions.
Both sides of every detected collision. Lets callers distinguish benign cross-file collisions in CodeGen's +100000 staging zone (sequences are renumbered by spUpdateExistingEntityFieldsFromSchema between migrations, so the same staged value recurring in a LATER migration never collides at runtime) from real same-file or real-sequence collisions.