message: Optimise `isWide()` for the very common latin cases
diff: @@ -43,6 +43,10 @@ export function countCodePoints(str: string): number {
  }
  export function isWide(codePoint: number): boolean {
  + if (codePoint < 4352) {
  + return false;
  + }
  +
  if (codePoint >= 0x10000) {
  return true;
  }
  