Wrap auto-completed list input values with square brackets if required #587

In Gatsby's connections, you can add a sort input like the following:

allMarkdownRemark(sort: { fields: [frontmatter___title], order: DESC}) {
  edges {
    node {
      id
    }
  }
}

But in graphiql, it doesn't enforce that fields must be an array so people regularly complain sorting is broken as they just add a field in the UI and then when they try to copy that into a project it won't work.

Is there a reason graphiql is like this? It seems to be casting the single values to an array which is why it seems to work.