Stricter array summary in CML output

[ukmo-ccbunney]

🚀 Pull Request

Closes: #6244

Description

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• benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts

[bjlittle]

@ukmo-ccbunney Lookin' good.

Just some initial comments to consider 👍

[codecov]

Codecov Report

❌ Patch coverage is 41.29032% with 91 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.99%. Comparing base (0a881ee) to head (31cea83).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/iris/util.py	39.28%	50 Missing and 1 partial ⚠️
lib/iris/coords.py	16.27%	31 Missing and 5 partials ⚠️
lib/iris/cube.py	85.71%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6743      +/-   ##
==========================================
- Coverage   90.29%   89.99%   -0.30%     
==========================================
  Files          91       91              
  Lines       24475    24608     +133     
  Branches     4571     4601      +30     
==========================================
+ Hits        22100    22147      +47     
- Misses       1607     1687      +80     
- Partials      768      774       +6     

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[trexfeathers]

A real-life case of CML protecting us, if you were interested:

SciTools/iris-grib#708

[ukmo-ccbunney]

The latest commit 029867f changes the behaviour of the assert_CML function to generate data statistics in the CML rather than in a separate JSON file. This will make all the tests that call assert_CML(approx_data=True) to fail.

If you are happy with the approach, then I will update the tests accordingly.

[ukmo-ccbunney]

Commit 31cea83 removes JSON data stats files and puts the results in the CML instead via a stats sub element.
Note, this implies loading the data which removes the state attribute (much like calculating the checksum does).