Sesam readers2

[lewisblake]

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[lewisblake]

Just opening this draft PR to see files that changed. Problems with caching of const mean I'm opening a different PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.44%. Comparing base (0db402e) to head (df4a2e6).

❗ Current head df4a2e6 differs from pull request most recent head 1d0d030. Consider uploading reports for the commit 1d0d030 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev     #909      +/-   ##
============================================
+ Coverage     78.99%   80.44%   +1.45%     
============================================
  Files           106      102       -4     
  Lines         18506    17464    -1042     
============================================
- Hits          14618    14049     -569     
+ Misses         3888     3415     -473     

Flag	Coverage Δ
unittests	80.44% <100.00%> (+1.45%)	⬆️

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