rails/rails — pull request #15778 by sgrif (2014-06-17 19:56:02+00:00)
Title: Move pg array database type casting to the Array type

The case where we have a column object, but don't have a type cast method involves type casting the default value when changing the schema. We get one of the column definition structs instead. That is a case that I'm trying to remove overall, but in the short term, we can achieve the same behavior without needing to pass the adapter to the array type by creating a fake type that proxies to the adapter.