Access array without it cloning it. (#160)

All credits to Evan for finding this.

Co-authored-by: Evan Laufer <evan.m.laufer@gmail.com>

src/ir/term/mod.rs

@@ -1511,7 +1511,7 @@ pub fn eval_op(op: &Op, args: &[&Value], var_vals: &FxHashMap<String, Value>) ->
             args.iter().cloned().cloned().collect(),
         )),
         Op::Select => {
-            let a = args[0].as_array().clone();
+            let a = args[0].as_array();
             let i = args[1];
             a.select(i)
         }