fix: add lower and upper bounds for deltaangle

[Saransh-cpp]

Description

Fixes #463

Kindly take a look at CONTRIBUTING.md.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.68%. Comparing base (1b88710) to head (628ef60).
Report is 29 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #465   +/-   ##
=======================================
  Coverage   86.67%   86.68%           
=======================================
  Files          96       96           
  Lines       11836    11836           
=======================================
+ Hits        10259    10260    +1     
+ Misses       1577     1576    -1     

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[Saransh-cpp]

A gentle bump on this, @jpivarski.

[jpivarski]

Looks good! This isn't the sort of change that would need amendments, so I'm going to merge it now.