tests only require one numerical relationship between cdf and pdf to be close

[YeungOnion]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.01%. Comparing base (a2b17af) to head (a994492).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
src/distribution/internal.rs	70.96%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   95.27%   95.01%   -0.27%     
==========================================
  Files          60       60              
  Lines       14291    13529     -762     
==========================================
- Hits        13616    12854     -762     
  Misses        675      675              

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[YeungOnion]

hmm, the test failure for geometric is interesting. But these changes are solely around the numerical integration/differentiation relationship between cdf and pdf. I'll open an issue.