Clarification to transaction identifier idempotent semantics #1449
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The Client-Server API currently describes requests as being "idempotent" in the transaction identifier section:
However, there is no definition of what the expected idempotency semantics are.
I've attempted to clarify what I believe are the intended semantics.
I've also added a complement test for this behaviour: matrix-org/complement#622
Preview: https://pr1449--matrix-spec-previews.netlify.app