Arrays are not recognized as iterable

[alexflint]

In my code I use the following type to represent points in 2d

type Vec2 [2]float64

I realize that graphql does not have any explicit representation for fixed-size arrays so I'm happy to expose this in the api as simple a list of floats, ie

graphql.NewList(graphql.Float)

However, when I register this field, I get an error saying that my field is not iterable. If instead I return a slice from my resolver then I get the expected behavior. This is rather frustrating as I have to manually register a resolver everywhere that I return a Vec2 to turn the array into a slice.

I think this library should recognize fixed-size arrays as iterable.

[alexflint]

Here is the line that causes the problem:

https://github.com/graphql-go/graphql/blob/master/executor.go#L785