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configure_union_passthrough was unwrapping every PEP 695 type alias to its base type, so a custom structure hook registered for the alias never ran when the alias appeared inside a passthrough union (Trimmed | int returned the raw string). Only unwrap aliases that still use the default type-alias factory. Aliases with a dedicated hook stay in spillover so converter.structure applies them. Fixes python-attrs#797
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Changes
Fixes #797
configure_union_passthroughwas unwrapping every PEP 695 type alias to its base type. A custom structure hook registered for the alias therefore never ran when the alias appeared inside a passthrough union (Trimmed | intreturned the raw string).Only unwrap aliases that still use the default type-alias factory. Aliases with a dedicated hook stay in spillover so
converter.structureapplies them. Directregister_structure_hookregistrations are detected via_direct_dispatchas well as predicate hooks on the function dispatch.Checklist