yesodweb/persistent — pull request #168 by maxcan (2013-10-07 06:12:16+00:00)
Title: Dropped o prefix for JSON encoding of PersistObjectIds #136

Addressing the comment I made in https://github.com/yesodweb/persistent/issues/136#issuecomment-25786829

I bumped the version numbers because the JSON this creates will not be backwards compatible with older library versions.