docs: def add_delete(self, value):
          """Delete a tag or populator by value - these are processed before upserts"""
  
          value = value.strip()
          v = value.lower()
          self.lower_val_to_val[v] = value
          if len(v) == 0:
              raise ValueError("Invalid value for delete. Value is empty.")
  
          self.deletes.add(v)