default:
		return false
	}

	if argLen > sys.ExecArgLengthLimit {
		return true
	}

	// On the Go build system, use response files about 10% of the
	// time, just to exercise this codepath.
	isBuilder := os.Getenv("GO_BUILDER_NAME") != ""
	if isBuilder && rand.Intn(10) == 0 {
		return true
	}

	return false
}

// encodeArg encodes an argument for response file writing.