See --[[Joey]] Needs ghc newer than 7.6.3. It may be possible to port Data.Type.Equality and Data.Type.Bool to older versions; I got them to compile but they didn't work right. --[[Joey]] I have a `resourceconflict` branch that adds this in Propellor.Resources, but it is not yet integrated into the Property types. --[[Joey]] [[!tag user/joey]]