FR: Divide into double, not Py_ssize_t

[janezd]

Issue

• With cdivision=true, dividing two ints resulted in an int,
• and were also stored into Py_ssize_t,
• with the former also masking a division by zero,
• in a place where the division was unnecessary anyway.

Luckily, this probably didn't effect the algorithm a lot.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3cd58f9) 73.28% compared to head (1bf2dfd) 73.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
+ Coverage   73.28%   73.35%   +0.06%     
==========================================
  Files          21       21              
  Lines        2976     2976              
==========================================
+ Hits         2181     2183       +2     
+ Misses        795      793       -2     

see 1 file with indirect coverage changes

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