if (inputState === InputState.Root) {
if ("0" <= event.key && event.key <= "9") {
return (inputCount = (inputCount ?? 0) * 10 + parseInt(event.key));
if (inputState === InputState.Root) {
if ("0" <= event.key && event.key <= "9") {
return (inputCount = (inputCount ?? 0) * 10 + parseInt(event.key));