Hey there, glad it worked for you!
The Go folks are still curious as to exactly what caused the problem in the first place.
In particular, that command:
GODEBUG=x509roots=1 go test -v -run TestSystemRoots crypto/x509
You’ll need to download the Go language and install it first, here’s a direct link for macOS: https://dl.google.com/go/go1.13.5.darwin-amd64.pkg
After that, you might need to open a new terminal or even log out / log in again, see https://golang.org/doc/install#macos
The fix I shipped is just a workaround, hopefully the root issue can be resolved!
Thanks again for getting back to me every time :)