go-stdlib-methods.ts lists the methods of 130 standard-library types with
their parameter and result counts. Its generator lived in a validation kit.
scripts/gen-go-stdlib-methods.mjs reads a Go source tree with the engine's
Go grammar, counts with the engine's own goSignatureArity, and prints (or
--write's) the table for the types it lists, so a later Go release's
methods are one command away. Against go1.27.3 it reproduces the table byte
for byte.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>