Use null for erased values to aid serialization

scripts/stats.py

@@ -0,0 +1,15 @@
+stats = {}
+acc = ''
+name = ''
+for line in open('newt.js'):
+    if line.startswith('const'):
+        if name: stats[name] = len(acc)
+        acc = line
+        name = line.split()[1]
+    else:
+        acc += line
+if name: stats[name] = len(acc)
+
+sorted_stats = sorted(((v, k) for k, v in stats.items()))
+for value, key in sorted_stats:
+  print(value, key)