fixing #127

[thomasstorm]

Tiny PR that simply removes a few superfluous lines, and updates some default parameters. I fixes #127.

Checklist:

• Issue has been created for change
• Added docstrings and API docs for any new/modified user-facing classes and functions - dna
• New/modified features documented in docs/source/* - dna
• Changes documented in CHANGES.md
• GitHub CI passes
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.66%. Comparing base (1b4b033) to head (296593d).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   91.67%   91.66%   -0.01%     
==========================================
  Files          13       13              
  Lines        2812     2809       -3     
==========================================
- Hits         2578     2575       -3     
  Misses        234      234              

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