Typical

This introduces the following changes:

- Improvement: Stricter validation of inputs for typed classes (78)
- Improvement: Cleaner reprs for Constraints more readable error reporting
- Bugfix: Always use the intersection of fields_in and value keys in des.

Certain advanced arbitrary types are properly supported in our SerDes protocol, but fail when attached to a class definition. This resolves those issues and adds tests using the pandas library.

This resolves 75

In certain cases a name wasn't passed on during finalization of nested objects or arrays. This is now resolved.

As a result of expanding support for sub-types, there were a few disparate methods in use to determine which parent-type to use for certain operations. Namely, this resulted in incompatibility between the Constraints system and the Schema system.

This release introduces a unified approach to resolving parent-type which guarantees a more consistent resolution across systems.

Expanding support of subclassed builtins resulted in unexpected and potentially broken behavior when generating schema/constraints for those objects. This release resolves those issues with explicit behavior for those cases.

Changes:

* Bugfix: Collision in translator for classes with the same name (66 )
* Bugfix: Support subclasses of known formats in schema gen (67 )
* Improvement: Support defaultdict (67 )