title: insert array on Int in prisma
body: <p>My <code>datamodel.prisma</code> looks like the following:</p>
  
  <pre><code>type Group {
    id: ID!
    name: String!
    postcodes: [Int!]!
  }
  </code></pre>
  
  <p>I have generated a prisma-client, and then calling <code>createGroup()</code> as follows:</p>
  
  <pre><code>await prisma.createGroup({ name: group.name, postcodes: [1, 2] });
  </code></pre>
  
  <p>I am getting an error</p>
  
  <pre><code>{ Error: Variable '$data' expected value of type 'GroupCreateInput!' but got: {"name":"Albury","postcodes":[1,2]}. Reason: 'postcodes' Expected 'GroupCreatepostcodesInput',
   found not an object. (line 1, column 11):
  </code></pre>
  
  <p>Any idea how to insert an array of <code>Int</code> in prisma?</p>