Add a more flexible save function for positions dtype

[mattcieslak]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.08824% with 46 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.63%. Comparing base (a6a5236) to head (97cd95f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
include/trx/trx.tpp	14.28%	36 Missing ⚠️
src/trx.cpp	88.00%	9 Missing ⚠️
include/trx/trx.h	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
- Coverage   88.84%   88.63%   -0.21%     
==========================================
  Files          15       15              
  Lines        7456     7736     +280     
  Branches     1021     1042      +21     
==========================================
+ Hits         6624     6857     +233     
- Misses        832      879      +47     

Flag	Coverage Δ
linux	87.82% <82.60%> (-0.19%)	⬇️
macos	88.45% <82.62%> (-0.20%)	⬇️

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