class_docstr: A setting meant only for saving an item count
  
  The HiddenCount setting should never be in the visible settings.
  It should be tied to a sequence variable which gives the number of
  items which is the value for this variable.
code: def get_value(self):
      return len(self.__sequence)
  
file_path: CellProfiler/src/subpackages/core/cellprofiler_core/setting/_hidden_count.py
imports: from ._setting import Setting
label_desc: Use image node_id 3 for calling the HiddenCount obj's underlying member method code with example usage: obj.get_value() and returns: len