Property vs. Provider

[Vampire]

Should org.ajoberstar.grgit.gradle.GrgitServiceExtension#getService really return a Property?
Property is for things that should be configurable.
You probably should just expose it as Provider which is a super-interface of Property.
You might also want to call disallowChanges() and finalizeValueOnRead() on the property after you have set its value to turn it into a cached provider effectively.