src/vs/editor/common/core/characterClassifier.ts/CharacterClassifier/_createAsciiMap
class CharacterClassifier:	private static _createAsciiMap(defaultValue: number): Uint8Array {
		const asciiMap: Uint8Array = new Uint8Array(256);
		for (let i = 0; i < 256; i++) {
			asciiMap[i] = defaultValue;
		}
		return asciiMap;
	}