_orm.selectinload

This release introduces performance improvements across ORM loading strategies, notably optimizing `selectinload` by skipping unnecessary `.unique()` calls and processing rows as tuples. It also enhances session execution option propagation and fixes several bugs related to declarative metadata resolution and result filtering compatibility.

This release primarily focuses on bug fixes across the ORM, particularly concerning polymorphic loading and identity map usage. It also includes improvements to MSSQL dialect handling and typing resolution for better compatibility with modern typecheckers.