fixtures/ is the shared contract corpus: accepted payloads with their canonical JSON and
digest, refused payloads with the rule each breaks, raw byte sequences that must not even
parse, recipes for the payloads too large to store, the U64 and double boundaries, rational
arithmetic vectors, the identity matrix, descriptor cross-checks, operation keys and bodies,
trace comparison variants, the schema set and its digest, seed vectors and one FLYSESS1
envelope. packages/session-types loads the same files.
Tests: 45 across nine files. Round trips preserve every field and reproduce the recorded
canonical bytes; duplicate keys, invalid UTF-8, NaN, trailing data, oversize typed values and
oversize envelopes fail; U64 and double boundaries reject on the right side; the four
identities never accept one another spellings; the accumulator produces 16, 17, 17 and a zero
remainder; the trace comparator ignores wall time, request ids, callIds and delivery ids and
notices every behaviour change; the contract digest survives reformatting and moves when a
field, bound, enum member or type changes.
Also: a crate README, and the update_fixtures example that regenerates the derived files.
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