add lazy context tracking.

[daveshanley]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.63%. Comparing base (2f764db) to head (f068e6e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #241   +/-   ##
=======================================
  Coverage   97.63%   97.63%           
=======================================
  Files          56       56           
  Lines        5323     5323           
=======================================
  Hits         5197     5197           
  Misses        126      126           

Flag	Coverage Δ
unittests	97.63% <100.00%> (ø)

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