set_partial_values improvements

[LDeakin]

• Expand set_partial_values tests
• Specialise set_partial_values for MemoryStore
• [async_]store_set_partial_values no longer truncates
  • this could corrupt values depending on the order of set_partial_values calls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.94%. Comparing base (0dfbe6a) to head (423fa26).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   81.91%   81.94%   +0.03%     
==========================================
  Files         157      157              
  Lines       21540    21566      +26     
==========================================
+ Hits        17645    17673      +28     
+ Misses       3895     3893       -2     

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