This is a hot fix release to address a regression in 1.1.321.
Bug Fix: Fixed recent regression that led to a false positive when assigning a union of types that use invariant type parameters to a protocol that uses a covariant type parameter. This fix was already incorporated into this week's preview release of pylance (v2023.8.21), so it shouldn't affect pylance users.
Bug Fix: Fixed a bug that led to a spurious "Unknown" type when an assignment to a variable with a type annotation was used within a loop.
Bug Fix: Fixed false positive error when an empty tuple was used in an except statement.