fix

test/Node.ts

@@ -49,8 +49,18 @@ test ('serialize table', (t) => {
 });
 
 test ('adhere to naming convention', (t) => {
+  const n = new Node ('invalid.name', 'parent');
+  t.is (n.name, 'invalidname');
+});
+
+test ('throw on invalid name', (t) => {
   t.throws (() => {
-    const n = new Node ('invalid.name', 'parent');
+    const n = new Node ('564#+-.,/@', 'parent');
     return n.toString ();
   }, { message: 'invalid name specified' });
 });
+
+test ('leave numbers after the first letter', (t) => {
+  const n = new Node ('i123nvalid.name', 'parent');
+  t.is (n.name, 'i123nvalidname');
+});