e9d5df647d2df520f21952959592854044ee01d7
z.union picks the first member that parses successfully, so a body
with { name, parentId } would silently be parsed as a rename and the
parentId dropped. The route comment claimed this was rejected — it
wasn't. Adding .strict() to each branch makes the rejection real:
both members refuse extra keys, the union produces a 400, and the
rep gets feedback instead of a silent half-op.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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