fix: handle OverflowError in _parse_int and fix parse_float type annotation

[Copilot]

Addresses two issues raised in the PR #578 review.

Changes

• _parse_int – catch OverflowError: The int(float(val)) fallback only caught ValueError. Inputs like "inf" or "1e309" produce float('inf'), and int(inf) raises OverflowError, which would bubble up to callers instead of falling back to the default.

  # before
  except ValueError:
      return None
  # after
  except (ValueError, OverflowError):
      return None

• parse_float – fix type annotation: The function accepted bool/int via the new isinstance short-circuit but was still annotated val: str. Updated to val: bool | float | int | str.

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.38%. Comparing base (c437b99) to head (66abbe9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #588   +/-   ##
=======================================
  Coverage   98.38%   98.38%           
=======================================
  Files          64       64           
  Lines        2417     2417           
=======================================
  Hits         2378     2378           
  Misses         39       39           

Flag	Coverage Δ
unittests	98.38% <0.00%> (ø)

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