Load factory dims tmptst

[pp-mo]

WIP just to see what breaks when I enable "default" load settings.

[codecov]

Codecov Report

Attention: Patch coverage is 95.53571% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.87%. Comparing base (e892fd1) to head (f9bfa97).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/iris/__init__.py	93.33%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6192      +/-   ##
==========================================
+ Coverage   89.82%   89.87%   +0.05%     
==========================================
  Files          88       88              
  Lines       23185    23303     +118     
  Branches     4314     4335      +21     
==========================================
+ Hits        20825    20944     +119     
  Misses       1628     1628              
+ Partials      732      731       -1     

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