Can't map a generic array

[hborders]

Demonstrates a bug where attempting to map to a generic array of a generic superclass whose type is specified explicitly by a subclass always yields nil.

[tristanhimmelman]

Hi there,
There we a couple issues with the code in your PR. I was able to get your test case working by doing the following:

• The Generic type within the WithGenericArray needed to conform to Mappable
• The JSON string passed into the testSubclassWithGenericArrayInSuperclass() function had a bug in the array format
  I committed my changes and merged them into master if you want to take a look.
  Tristan

[hborders]

Thanks! I applied your suggested fix and my internal code works fine now.