GraphQLNullable nil coalescing

[calvincestari]

From community topic https://community.apollographql.com/t/ios-1-0-graphqlnullable-null-coalescing/4681/1.

For something like:

let cursor: String? = "blah"

let query: Query = Query(pagination: Pagination(before: cursor ?? .none))

I keep getting the following error:

Cannot convert value of type ‘String?’ to expected argument type ‘GraphQLNullable’

[calvincestari]

See Pocket/pocket-ios#277 for a reproducible sample.