Add get_current_history_length() to workflow info #73
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What was changed
Add
get_current_history_length()
on the workflow info instanceWhy?
Users need length for some continue-as-new checks. Like Go at temporalio/sdk-go#851, we have chosen to put this as a getter on the info. We chose to use an explicit method instead of a property getter so it is clear to users this is not a property on the frozen workflow info.