explicitly type the assert

[mmomtchev]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.50%. Comparing base (34e83d9) to head (3093394).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files           1        1           
  Lines         405      405           
=======================================
  Hits          403      403           
  Misses          2        2           

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