build/lib/mangleTypeScript.ts/ShortIdent/convert
class ShortIdent:	private static convert(n: number): string {
		const base = this._alphabet.length;
		let result = '';
		do {
			const rest = n % base;
			result += this._alphabet[rest];
			n = (n / base) | 0;
		} while (n > 0);
		return result;
	}