Todo
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- check subjectAltName for JIDs (core sec. 5.1 rule 8)
- introduce some 'randomness' for IDs
- introduce return values for *Handlers to indicate whether following handlers should be invoked as well
- sort SRV records by weight & cost
- get rid of iksemel (and don't introduce another hard requirement)
- unify error recognition
- thread safety
- look into IPV6 support


In the pipe
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- doc for every class

