fix: head(-1) forwards to the default implementation

[krlmlr]

Closes #131.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 9.85%. Comparing base (af5ca26) to head (79bc532).
Report is 28 commits behind head on main.

❗ Current head 79bc532 differs from pull request most recent head cddc4ba. Consider uploading reports for the commit cddc4ba to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##            main    #156      +/-   ##
========================================
+ Coverage   9.81%   9.85%   +0.04%     
========================================
  Files        129     130       +1     
  Lines      22665   22791     +126     
========================================
+ Hits        2225    2247      +22     
- Misses     20440   20544     +104     

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