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Tests have a with-client macro & shutdown of client is safely repeatable.
Tests around tracking
Pulling out trackers and introducing the concept of a session
Introducing sessions to keep state sensible.
Notes for tomorrow.
Fixing use of atoms for sessions
Using nrepl session
ignore private defns
tracking code is op aware
Propagate session id to HUB
Test that breaks because nrepl-server to hub connections should be
session bound.