Should throw error when a JSON instead of a File is received from client

[HosseinAgha]

When I send a JSON (number, string, object, etc) instead of a File from client, I don't get any errors and the argument returns a JS Object instead of Promise<FileUpload>.
Is this working correctly? Shouldn't this throw an error in the parseValue of scalar? We are expecting a stream after all.
This forces us to validate the input every time we are using Upload scalar.

I'm using Apollo Server (and apollo-upload-client which does not matter in this scenario)

[mike-marcacci]

Thanks for the report @HosseinAgha. I can confirm what you're describing: when a variable of type Upload is provided by a variable but is not supplied in the request (that is, not present in the map), the contents of the variable are never replaced. This should indeed cause an error.