Update to FastCS 0.7.0

[GDYendell]

Fixes #43

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.20%. Comparing base (4af946e) to head (2e4d0e3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   72.20%   72.20%           
=======================================
  Files           4        4           
  Lines         295      295           
=======================================
  Hits          213      213           
  Misses         82       82           

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