Allow expression evaluator to return an array if stack contains multiple values

app/Engine/Cfnpp/Expression/Expression.php

@@ -43,7 +43,7 @@ class Expression
 	 * Evaluate the tokens contained in this expression.
 	 *
 	 * @param  array<string,mixed> $variables variables that can be referenced
-	 * @return mixed
+	 * @return mixed               if expression evaluated down to a single value a scalar, otherwise an array
 	 */
 	public function evaluate(array $variables = [])
 	{
@@ -83,7 +83,7 @@ class Expression
 			return end($this->stack);
 		}
 
-		throw new \Exception('Expression did not evaluate down to a single value');
+		return $this->stack;
 	}
 
 	/**