NoTypedChildren should return a Hash, not Array

Author: rmosolgo

lib/graphql/internal_representation/node.rb

@@ -6,7 +6,7 @@ class Node
       DEFAULT_TYPED_CHILDREN = Proc.new { |h, k| h[k] = {} }
 
       # A specialized, reusable object for leaf nodes.
-      NO_TYPED_CHILDREN = Hash.new([].freeze)
+      NO_TYPED_CHILDREN = Hash.new({}.freeze)
       def NO_TYPED_CHILDREN.dup; self; end;
       NO_TYPED_CHILDREN.freeze