Core

• Fix race condition during reconnect sends UNSUB messages #1321 @ajax-surovskyi-y
• Add connection auth token supplier option #1324 @buleuszmatak
• Nano time for elapsed timings and Nats System Clock #1334 @scottf
• Replace Timer with scheduled tasks #1335 @scottf
• [Bug] Fix UNSUBs after disconnect can cause auth violations #1336 @scottf @ajax-surovskyi-y
• Options allow token supplier from property, not just api method #1349 @scottf

JetStream

• Annotating API objects with NotNull and Nullable #1333 @scottf
• [Bug] MessageConsumer.isFinished() not set properly in certain conditions #1339 @scottf
• [Bug] Pull Heartbeat handler intermittent failure after switch to scheduler #1345 @scottf
• Fix heartbeat timer handling broken when replacing timer with scheduler. #1348 @scottf

Key Value

• Nats-Marker-Reason must be mapped to a Key Value Operation #1323 @scottf
• KV Purge Per Message TTL #1344 @scottf

Tests

• Addition validation and test for token / token supplier #1325 @scottf
• Add test for auth violations during reconnect #1328 @ajax-surovskyi-y
• Fixed KV Limit Marker Test to only run against 2.11.2 or later #1338 @scottf
• Fix flapping test: testOverflowFetch #1340 @scottf
• Set the test timeout default to 3 minutes. #1343 @scottf

Misc

• Better Json Print Formatter #1327 @scottf