src/vs/editor/common/core/characterClassifier.ts/CharacterClassifier/get
class CharacterClassifier:	public get(charCode: number): T {
		if (charCode >= 0 && charCode < 256) {
			return <T>this._asciiMap[charCode];
		} else {
			return <T>(this._map.get(charCode) || this._defaultValue);
		}
	}