graphiql does not properly validate default values for required fields

[slisaasquatch]

Here's the ticket for the new spec: graphql/graphql-spec#418
It allows the schema to be defined like this:

type Query {
  field(arg: Int! = 0): Int
}

For the example above, if you don't provide arg in the query, graphiql will consider the query invalid.

[thomasheyenbrock]

I tried to reproduce this exact example in the latest version, but couldn't. Both queries { field } and { field(arg: 42) } don't get any linter errors and execute fine. Closing this as the issue seems to have been fixed at some point in the past.