[varLib.featureVars] Add TODO for moving things to fontTools.misc

Lib/fontTools/varLib/featureVars.py

@@ -11,6 +11,8 @@ from fontTools.otlLib.builder import buildLookup, buildSingleSubstSubtable
 from collections import OrderedDict
 
 
+# TODO Move to fontTools.misc?
+
 # https://stackoverflow.com/questions/1151658/python-hashable-dicts
 class hashdict(dict):
     """
@@ -72,6 +74,8 @@ class hashdict(dict):
         dict.update(result, right)
         return result
 
+# TODO Move to fontTools.misc?
+
 def popCount(v):
     if v > 0xFFFFFFFF:
         return popCount(v >> 32) + popCount(v & 0xFFFFFFFF)