src/vs/platform/contextkey/common/contextkey.ts/ContextKeyNotExpr/create
class ContextKeyNotExpr:	public static create(key: string): ContextKeyExpression {
		const staticValue = STATIC_VALUES.get(key);
		if (typeof staticValue === 'boolean') {
			return (staticValue ? ContextKeyFalseExpr.INSTANCE : ContextKeyTrueExpr.INSTANCE);
		}
		return new ContextKeyNotExpr(key);
	}