all gen-api support optional (src ast.Node)

[xushiwei]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9c69218) 88.50% compared to head (93a9317) 88.50%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   88.50%   88.50%           
=======================================
  Files           7        7           
  Lines          87       87           
=======================================
  Hits           77       77           
  Misses         10       10           

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