Document ErrResultPending's behavioral gap explicitly #1229
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Resolving this "two kinds of finished-timeouts / heartbeat-timeouts, but only one config" issue with ErrResultPending will need some new semantics on the server side... but at least there's a workaround until then.
The general concept of a "pending activity" does seem worth supporting, particularly because it can respond with an "already completed" error when a second "complete" request is received. It just has unfortunate quirks at the moment.