fix: filter invalid characters from the type name (#2127)

Fixes #2124.

There is no reason why the type name would contain anything other than
alphanumeric characters. Filter the remaining characters with a regex.

Author: alexander-fenster

src/type.js

@@ -29,6 +29,7 @@ var Enum      = require("./enum"),
  * @param {Object.<string,*>} [options] Declared options
  */
 function Type(name, options) {
+    name = name.replace(/\W/g, "");
     Namespace.call(this, name, options);
 
     /**