Number:

• message ref from "x" to "ref:x" / "context:x" (assert)
• message ref from value to ref:x / context:x (rule)
• context ref changed to actual ref object

Array / Object:

• message ref from "x" to "ref:x" / "context:x"
• context ref changed to actual ref object and added value

Date:

• message ref from actual value to "ref:x" / "context:x" / "now"
• context ref changed to actual ref object or "now"

String:

• message ref from value to ref:x / context:x
• context ref changed to actual ref object