yesodweb/persistent — comment on commit e88300b42c489019131c3ae26333db218f6317b9
File: persistent/Database/Persist/Store.hs line 375
By gregwebs:

I was thinking that the serialization would be to PersistText and that the extra type information would be in the column/field. But I am fine with the approach you are favoring.

I added a nooverlap flag that we can use to test out our assumption that OverlappingInstances is only being used for String.