Preprocessing

src/prolog/builtins/arithmeticOperators.kt

@@ -152,8 +152,8 @@ class Between(private val expr1: Expression, private val expr2: Expression, priv
 
         require(e1.to is Integer && e2.to is Integer) { "Arguments must be integers" }
 
-        val v1 = e1.to as Integer
-        val v2 = e2.to as Integer
+        val v1 = e1.to
+        val v2 = e2.to
 
         return if (variable(e3.to, subs)) {
             between(v1, v2, e3.to as Variable).map { answer ->