feat(builder)!: new API and docs

[tmzane]

Also add panic on a zero-length slice argument.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.50%. Comparing base (3f928a0) to head (abe3287).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   79.72%   79.50%   -0.22%     
==========================================
  Files           3        3              
  Lines         286      283       -3     
==========================================
- Hits          228      225       -3     
  Misses         46       46              
  Partials       12       12              

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