func (a *Args) AddBytesKNoValue(key []byte) {
	a.args = appendArg(a.args, b2s(key), "", argsNoValue)
}
func (a *Args) AddBytesKNoValue(key []byte) {
	a.args = appendArg(a.args, b2s(key), "", argsNoValue)
}
// AddBytesKNoValue adds only 'key' as argument without the '='.
//
// Multiple values for the same key may be added.