[ENHANCEMENT] Continued typing improvements and coverage. #759, #771, #781
[ENHANCEMENT] Allow binding to IPv6 addresses. #657
[ENHANCEMENT] Negotiate gzip content-encoding, enabled by default. #776
[ENHANCEMENT] Allow disabling _created metrics via the PROMETHEUS_DISABLE_CREATED_SERIES environment variable. #774
[BUGFIX] Correct minor typo in exception raised when exemplar labels are too long. #773