code: def keys(self, prefix=None, delimiter=None):
          
          if delimiter:
              # WE REALLY DO NOT GET KEYS, BUT RATHER Prefix OBJECTS
              # AT LEAST THEY ARE UNIQUE
              candidates = [k.name.rstrip(delimiter) for k in self.bucket.list(prefix=prefix, delimiter=delimiter)]
          else:
              candidates = [strip_extension(k.key) for k in self.bucket.list(prefix=prefix)]
  
          if prefix == None:
              return set(c for c in candidates if c != "0.json")
          else:
              return set(k for k in candidates if k == prefix or k.startswith(prefix + ".") or k.startswith(prefix + ":"))
docs: :param prefix:  NOT A STRING PREFIX, RATHER PATH ID PREFIX (MUST MATCH TO NEXT "." OR ":")
          :param delimiter:  TO GET Prefix OBJECTS, RATHER THAN WHOLE KEYS
          :return: SET OF KEYS IN BUCKET, OR