Go does has some form of monomorphization implemented in Go1.18; it is just behind a feature flag(compiler flags).

Look at the assembly difference between this two examples:

1. https://godbolt.org/z/7r84jd7Ya (without monomorphization)

2. https://godbolt.org/z/5Ecr133dz (with monomorphization)

If you don't want to use godbolt, run the command `go tool compile '-d=unified=1' -p . -S main.go`

I guess that the flag is not documented because the Go team has not committed themselves to whichever implementation.