Support Iterable types that are not List, Set, or array types

[mikejhill]

Iterable types that do not implement the List or Set interfaces or are array types are serialized as objects rather than collections. It would be helpful to serialize these as arrays.

This causes issues when attempting to serialize other collection types that do not implement the List or Set interfaces, such as java.util.HashMap#values.

The default Jackson implementation appears to serialize Iterable types as collections by default through IterableSerializer (at least I believe it's by default -- it might be a configuration that I'm not seeing).

In order to enable serializing Iterable types as collections, we would need to make a small modification in the JsonViewSerializer#writeList(Object) method:

-    boolean writeList(Object obj) throws IOException {
-      if(obj instanceof List || obj instanceof Set || obj.getClass().isArray()) {
-      // ...
+    boolean writeList(Object obj) throws IOException {
+      if(obj instanceof Iterable || obj.getClass().isArray()) {
+      // ...

Is there any reason not to do this?