Hi there,

setting the ZMQ_XPUB_VERBOSE option on an XPUB socket will only report multiple 
subscriptions - for unsubscription, only the last unsubscription is reported. 
This makes the option unusable to count actual subscribers as some might 
already have unsubscribed and you'd never know. Is there a reason 
unsubscriptions are not handled in the same manner as subscriptions? And of 
what use is ZMQ_XPUB_VERBOSE if I can't know the number of subscribers? 

This is not an oversight as a comment in xpub.cpp:73 reads: "[…] (Unsubscribe 
is not verbose.)".

Best regards
Stefan
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