annotate with Sequence rather than list & avoid mutable defaults

[tpgillam]

Allow users to specify e.g. tuples of values rather than lists (this previously works at runtime, but statically the types didn't allow it).

Also remove a couple of cases of default arguments being mutable.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.45%. Comparing base (2c66c8a) to head (84ac8de).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   73.39%   73.45%   +0.05%     
==========================================
  Files          58       58              
  Lines        5041     5041              
  Branches      964      964              
==========================================
+ Hits         3700     3703       +3     
+ Misses        964      962       -2     
+ Partials      377      376       -1     

Flag	Coverage Δ
python	72.54% <100.00%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
tests	100.00% <ø> (ø)
src	86.99% <100.00%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[MLopez-Ibanez]

Thank you!