Fix unhashable items inside tuples bug.

[danthedeckie]

Description

Fixes #173

(Also added in a bunch of unreachable pragmas for coverage - so get the percentage to pass build threshold again as a separate commit. - all lines that are inside test 'evil' functions that should never get run)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.47%. Comparing base (a4659fa) to head (9634f7b).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   98.68%   99.47%   +0.78%     
==========================================
  Files           2        2              
  Lines        1526     1522       -4     
==========================================
+ Hits         1506     1514       +8     
+ Misses         20        8      -12     

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