Schema Context is invariant?

[Peter Hunsberger]

Passing my version of the Schema into the Executor I ran into a type mismatch:

 found   : models.DseSchema

    (which expands to)  sangria.schema.Schema[ models.DseContext,AnyVal]

 required: sangria.schema.Schema[Object,AnyVal]

Note: models.DseContext <: Object, but class Schema is invariant in type Ctx.

You may wish to define Ctx as +Ctx instead. (SLS 4.5)

I think I can work around this, but from what I can tell this is on the Sangria side and if so there seems to be little point to the current definition?