Supress subnormal warning

[benjeffery]

Fixes #957

I think this is safe as the subnormals are tiny on a 64bit float.

@hyanwong I couldn't recreate the warning locally, maybe because of architecture differences - so can you confirm this suppresses the warning?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.17%. Comparing base (1c7928b) to head (61619b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #988   +/-   ##
=======================================
  Coverage   93.16%   93.17%           
=======================================
  Files          18       18           
  Lines        6368     6370    +2     
  Branches     1086     1086           
=======================================
+ Hits         5933     5935    +2     
  Misses        296      296           
  Partials      139      139           

Flag	Coverage Δ
C	93.17% <100.00%> (+<0.01%)	⬆️
python	95.52% <100.00%> (+<0.01%)	⬆️

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[hyanwong]

Looks like that fixed it. Thanks @benjeffery