Generated box type shadows implicitly imported FSharp.Core's box (FSharp.Core.Operators.box) function

[ArtemyB]

Probably the type should have box' name generated instead, like it is done in case of conflicts with keywords (e.g. open' for open prop). Or box name could be kept, but in that case to use the box operator it should be imported explicitly (e.g. to define let box = FSharp.Core.Operators.box before usage). However in Fable !! operator could be used instead, so the problem seems minor.