Fix mpow(2**n) for integer n

[rotu]

Previously, there was a loop termination condition error which caused the wrong result when exponentiating a matrix by a power of 2.

Fix #196

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.67%. Comparing base (4b632bb) to head (958421a).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   73.53%   73.67%   +0.13%     
==========================================
  Files          36       36              
  Lines        5733     5763      +30     
  Branches      937      943       +6     
==========================================
+ Hits         4216     4246      +30     
- Misses       1512     1517       +5     
+ Partials        5        0       -5     

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[targos]

Thanks!