Notably, (3) is exactly what's used by Go (see https://pkg.go.dev/cmd/gofmt https://pkg.go.dev/cmd/gofmt - "Gofmt formats Go programs. It uses tabs for indentat

Notably, (3) is exactly what's used by Go (see https://pkg.go.dev/cmd/gofmt https://pkg.go.dev/cmd/gofmt - "Gofmt formats Go programs. It uses tabs for indentation and blanks for alignment. Alignment assumes that an editor is using a fixed-width font.").