src/vs/base/common/keybindings.ts/SimpleKeybinding/getHashCode
class SimpleKeybinding:	public getHashCode(): string {
		const ctrl = this.ctrlKey ? '1' : '0';
		const shift = this.shiftKey ? '1' : '0';
		const alt = this.altKey ? '1' : '0';
		const meta = this.metaKey ? '1' : '0';
		return `${ctrl}${shift}${alt}${meta}${this.keyCode}`;
	}