Function internCharString

src/ink/screen.ts:845–847

* Intern a character string via the screen's shared CharPool. * Supports grapheme clusters like family emoji.

(screen: Screen, char: string)

 * Supports grapheme clusters like family emoji.
 */
function internCharString(screen: Screen, char: string): number {
  return screen.charPool.intern(char)
}

/**
 * Bulk-copy a rectangular region from src to dst using TypedArray.set().