Revert "Undo go-gen array change"

This reverts commit 5923c81.

Author: chipshort

packages/go-gen/src/schema.rs

@@ -246,6 +246,16 @@ pub fn array_item_type(
         Some(SingleOrVec::Single(array_validation)) => {
             schema_object_type(array_validation.object()?, type_context, additional_structs)
         }
+        Some(SingleOrVec::Vec(v))
+            if v.len() == 1 || v.len() > 1 && v.windows(2).all(|w| w[0] == w[1]) =>
+        {
+            // all items are the same type
+            schema_object_type(
+                v.first().unwrap().object()?,
+                type_context,
+                additional_structs,
+            )
+        }
         _ => bail!("array type with non-singular item type is not supported"),
     }
 }