fix: parse negative position

[phenylshima]

jpreprocess/jbonsai#127

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.50%. Comparing base (3e7bce5) to head (dba2288).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   87.48%   87.50%   +0.01%     
==========================================
  Files          10       10              
  Lines        1047     1048       +1     
==========================================
+ Hits          916      917       +1     
  Misses        131      131              

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