Please enhance implicit operator support

[taori]

As pointed out here: aspnet/Mvc#7724 (comment) it would be great if the implicit operator would support downcasting to interfaces it's implementing.

The syntax i desire to write is visible here:

@mkArtakMSFT tells me that this is a language issue. I was wondering what team of roslyn thinks about this.

[CyrusNajmabadi]

What are the types/declaration-code for "Ok" and "BadRequest"? it's hard to do anything with this given hte lack of that info.

[taori]

@CyrusNajmabadi

https://github.com/aspnet/Mvc/blob/760c8f38678118734399c58c2dac981ea6e47046/src/Microsoft.AspNetCore.Mvc.Core/OkObjectResult.cs

and

https://github.com/aspnet/Mvc/blob/760c8f38678118734399c58c2dac981ea6e47046/src/Microsoft.AspNetCore.Mvc.Core/BadRequestResult.cs

Should have added that to begin with - you're right.

[HaloFour]

Related: #563

[HaloFour]

#2460 ?