Github user oknet commented on the issue:
https://github.com/apache/trafficserver/pull/752
@shinrich INKVConnInternal::handle_event is almost same as
INKContInternal::handle_event but the INKContInternal::handle_event could
handle period event callback status.
They are share handle_event_count() and handle_event_count() also accept
INTERVAL event.
The INKVConnInternal::handle_event() should handle period event callback if
handle_event_count() does. Then the INKVConnInternal::handle_event() is totally
same as INKContInternal::handle_event().
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