src/vs/base/common/hash.ts/StringSHA1/constructor
class StringSHA1:	constructor() {
		this._buff = new Uint8Array(SHA1Constant.BLOCK_SIZE + 3 /* to fit any utf-8 */);
		this._buffDV = new DataView(this._buff.buffer);
		this._buffLen = 0;
		this._totalLen = 0;
		this._leftoverHighSurrogate = 0;
		this._finished = false;
	}