zopu-code/repos/effect-smol/.changeset/fix-schema-union-dispatch-order.md

effect

effect
patch

Fix union candidate selection and decoding order so that unions now:

• consider matches from every sentinel key instead of dropping valid members after the first match;
• reject ambiguous oneOf inputs when members with different sentinel keys both match;
• preserve declared member order when combining discriminated members with non-discriminated fallbacks;
• commit concurrent decoding results in declaration order instead of completion order.

Reserved SSE failure event names with non-Cause data are now emitted as application events instead of producing a runtime defect.