+val push: kam -> Entity.attrs -> Brg.bind -> kam
+
+val xwhd: Entity.status -> kam -> Brg.term -> kam * Brg.term
+
+(* arguments: expected type, inferred type *)
+val are_convertible:
+ Entity.status -> kam -> Brg.term -> kam -> Brg.term -> bool
+
+val specs: (kam, Brg.term) Log.specs