code: def processHint(self, index):
      cs = self.callingStack[-1]
      hints = cs._hints
      hints.has_hint = True
      hints.last_hint = index
      hints.last_checked = index
  
imports: from fontTools.misc import psCharStrings
  from fontTools import ttLib
  from fontTools.pens.basePen import NullPen
  from fontTools.misc.roundTools import otRound
  from fontTools.misc.loggingTools import deprecateFunction
  from fontTools.subset.util import _add_method, _uniq_sort
label_desc: Use image node_id 12 for calling the _DehintingT2Decompiler obj's underlying member method code with example usage: obj.processHint(index) without return types