Mark system Nexus envelope payloads#1667
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What changed
System Nexus envelope payloads encoded by the system Nexus payload converter now carry a
__temporal_system_payloadmetadata marker with valueb"true".Payload visitors now use that marker to detect system Nexus envelopes whenever they encounter an already-encoded payload. This lets nested user payloads inside the envelope still be decoded and visited even when the payload is no longer accompanied by a Nexus endpoint field.
Detection behavior
Detection is metadata-only. Unmarked payloads are treated as regular payloads, even if they are used as the input for the Temporal system Nexus endpoint. Marked payloads are treated as system Nexus envelopes regardless of endpoint.
Tests
./.venv/bin/pytest tests/nexus/test_temporal_system_nexus.py -q./.venv/bin/pytest tests/worker/test_visitor.py -qpoe lint