@async short lambdas not unpacked correctly?

[cambiata]

Using tink_await 0.6.0, oldschool anonymous functions work as expected, but arrowfunctions don't - the return value isn't unpacked correctly. Noticed when trying Future.ofJsPromise as below, but the same seems to happen when using all Futures:

@await class Main {
	@async static function main() {	
		
		// This works fine:
		js.Browser.document.onmousedown = @async function(e) {
		 	var int = @await Future.ofJsPromise(testJsPromise());
		 	trace(int);	// traces 1234
		};

		// This doesn't:
		js.Browser.document.onmousedown = @async (e)-> {
			var int = @await Future.ofJsPromise(testJsPromise());
			trace(int);	// traces the promise method	
		};
	}

	static function testJsPromise():Promise<Int> {
		return new Promise<Int>((res, rej)->{
			haxe.Timer.delay(()->res(1234), 1000);
		});
	}
}