s2-streamstore/s2-sdk-typescript

Patch Changes

• f7408f2: injectDedupeHeaders now throws a clear S2Error when a record already carries a reserved _dedupe_seq or _writer_id header, instead of silently appending duplicates. Previously the stale pre-existing header shadowed the injected sequence on the read side (readers pick the first match), corrupting dedupe filtering or crashing decodeU64 on a malformed value. Validation runs before any record is mutated.
• 3e857be: Reject empty serializations in SerializingAppendSession with a clear S2Error instead of crashing. Previously a serializer producing zero bytes (e.g. JSON.stringify(undefined)) made submit() throw an opaque TypeError while write() threw an S2Error; both paths now throw the same S2Error explaining that the serializer must produce at least one byte.