Use pattern matching for instanceof (#1019)

src/main/java/carpet/script/language/Functions.java

@@ -123,9 +123,8 @@ public class Functions {
                 return (cc, tt) -> result;
             }
             Value v1 = lv1.evalValue(c, Context.SIGNATURE);
-            if (!(v1 instanceof FunctionSignatureValue))
+            if (!(v1 instanceof FunctionSignatureValue sign))
                 throw new InternalExpressionException("'->' operator requires a function signature on the LHS");
-            FunctionSignatureValue sign = (FunctionSignatureValue) v1;
             Value result = expression.createUserDefinedFunction(c, sign.getName(), e, t, sign.getArgs(), sign.getVarArgs(), sign.getGlobals(), lv2);
             return (cc, tt) -> result;
         });

src/main/java/carpet/script/language/Sys.java

@@ -51,9 +51,8 @@ public class Sys {
 
         expression.addUnaryFunction("number", v ->
         {
-            if (v instanceof NumericValue)
+            if (v instanceof NumericValue num)
             {
-                NumericValue num = (NumericValue)v;
                 if (num.isInteger()) return new NumericValue(num.getLong());
                 return new NumericValue(num.getDouble());
             }