Bug: nested lists in input types are discarded by DataBinder

[koenpunt]

For a mutation with a schema like;

type BookInput {
  name: String!
  authorId: Int!
  options: [BookInputOption!]!
}

type Mutation {
  addBook(bookInput: BookInput!): ...
}

The options are discarded by the DataBinder, because it can't map a List of HashMaps to a List of BookInputOptions.

See this branch for a failing test: https://github.com/koenpunt/spring-graphql/tree/nested-list

[koenpunt]

Thanks for the quick turnaround @bclozel, but there's still an issue with constructor binding arguments.

I've updated my branch with a failing test case here: https://github.com/koenpunt/spring-graphql/tree/nested-list

The issue comes down to that propertyValues.get(paramName); doesn't understand a param name like items[0].name