menuitem doesn't pass an UploadEvent for onUpload

Steps to Reproduce

1.

<menuitem upload="true" label="Upload" onUpload='alert(event.media)'/>

2. click the menuitem
3. upload a file

Current Result

an error: Cannot access field: media, on object: [Event onUpload <Menuitem yW8Qa>]

Expected Result

no error. show the uploaded file name

Debug Information

• it passes an Event instead of an UploadEvent which breaks our own spec
• 8.5.2 works correctly and passes an UploadEvent for onUpload

Workaround

create the Upload event manually

		<menuitem label="upload" upload="true"
				  onUpload="Clients.log(UploadEvent.getLatestUploadEvent(event.getName(), event.getTarget()).media.name)"/>