Append armature with constraints?

I’m experimenting with appending and linking armature datablocks. When I append a modified armature datablock and drop it into the currently used armature object it does not seem that the constraints are coming with it.

I’m kind of beginning to fear that constraints apply to the object level, like posing… which I guess makes sense, but would mean that you can’t add constraints and then update an armature object mid pose…