Test: Cover a few hidden branches

[JSAbrahams]

Features

• Internal python primitives' method's marked as pure always.
• During testing we uncovered a bug where types were incorrectly assigned for defaults of function arguments.

Added Tests

• See added tests

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.73%. Comparing base (3c0b01c) to head (93cfddd).

Files with missing lines	Patch %	Lines
src/check/context/arg/generic.rs	90.90%	1 Missing ⚠️
src/check/context/field/generic.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #491      +/-   ##
===========================================
+ Coverage    88.91%   90.73%   +1.82%     
===========================================
  Files          104      103       -1     
  Lines        15028    14746     -282     
===========================================
+ Hits         13362    13380      +18     
+ Misses        1666     1366     -300     

Files with missing lines	Coverage Δ
src/check/ast/mod.rs	100.00% <ø> (ø)
src/check/ast/node.rs	99.20% <ø> (+5.28%)	⬆️
src/check/constrain/generate/mod.rs	95.38% <ø> (+1.44%)	⬆️
src/check/constrain/generate/operation.rs	96.87% <ø> (+8.35%)	⬆️
src/check/context/clss/generic.rs	95.28% <100.00%> (+2.42%)	⬆️
src/check/context/clss/python.rs	89.41% <100.00%> (ø)
src/check/context/function/generic.rs	99.10% <100.00%> (+6.31%)	⬆️
src/check/context/function/mod.rs	41.90% <ø> (ø)
src/check/context/parameter/generic.rs	100.00% <100.00%> (+100.00%)	⬆️
src/check/context/parameter/python.rs	80.95% <ø> (+32.38%)	⬆️
... and 13 more

... and 8 files with indirect coverage changes

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