Fix symbolic expression generators

[gerlero]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.13%. Comparing base (54b1903) to head (19f420b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #129   +/-   ##
=======================================
  Coverage   72.13%   72.13%           
=======================================
  Files           6        6           
  Lines         994      994           
=======================================
  Hits          717      717           
  Misses        277      277           

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[Copilot]

Pull request overview

This PR fixes a bug in the symbolic expression generator where strict=True was incorrectly used when zipping an infinite generator with a finite range.

• The _derivative_names() function is an infinite generator, which would cause a ValueError when zipped with range(3) using strict=True
• Changed strict=False on line 73 to allow the zip to stop at the shortest iterable (3 elements)

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