Add frame codec for length-prefixed nested values#4
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kasperisager
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Jul 10, 2026
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Adds a
frame(codec)primitive: a uint length-prefixed wrapper around an inner codec, byte-for-byte compatible with JScompact-encoding'sexports.frame. Wire form isuint(len(inner_bytes))followed by the inner encoding, with the inner encoded inline (length computed via a throwaway state, matching the JS reference).This is the runtime layer for encoding non-compact nested structs, which are length-prefixed on the wire. A later hyperschema-python change will emit
c.frame(...)for framed nested struct fields.Additive: no existing codec is touched. Re-exported from
__init__.py. 227 tests pass (9 new frame tests + 1 roundtrip row), ruff clean.