Add Dynamic::is_XXX API.

src/parser.rs

@@ -374,7 +374,7 @@ impl Expr {
     fn ensure_bool_expr(self) -> ParseResult<Expr> {
         let type_name = match self {
             Expr::Unit(..) => "()",
-            Expr::DynamicConstant(ref v, ..) if !v.is::<bool>() => v.type_name(),
+            Expr::DynamicConstant(ref v, ..) if !v.is_bool() => v.type_name(),
             Expr::IntegerConstant(..) => "a number",
             #[cfg(not(feature = "no_float"))]
             Expr::FloatConstant(..) => "a floating-point number",
@@ -1248,7 +1248,7 @@ impl Engine {
                         continue;
                     }
 
-                    if value.is::<INT>() && !ranges.is_empty() {
+                    if value.is_int() && !ranges.is_empty() {
                         return Err(PERR::WrongSwitchIntegerCase.into_err(expr.start_position()));
                     }