Consolidate builtin argument handling on payload

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.47368% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.95%. Comparing base (23526b0) to head (0d32e76).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/builtin_function_payload.rs	87.09%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   82.90%   82.95%   +0.05%     
==========================================
  Files          70       71       +1     
  Lines        3562     3550      -12     
==========================================
- Hits         2953     2945       -8     
+ Misses        609      605       -4     

Flag	Coverage Δ
unit	82.95% <89.47%> (+0.05%)	⬆️

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