Pymem improvements

[RainerKuemmerle]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 89.28571% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.36%. Comparing base (e588c3b) to head (309933f).
⚠️ Report is 3 commits behind head on pymem.

Files with missing lines	Patch %	Lines
g2o/types/data/raw_laser.cpp	71.42%	0 Missing and 4 partials ⚠️
g2o/core/block_solver.h	86.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            pymem     #946      +/-   ##
==========================================
+ Coverage   70.23%   70.36%   +0.13%     
==========================================
  Files         346      346              
  Lines       13497    13520      +23     
  Branches     1298     1303       +5     
==========================================
+ Hits         9479     9514      +35     
+ Misses       3591     3573      -18     
- Partials      427      433       +6     

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