code: def get_aligned_collection(self, value=0, data_type=None, unit=None, mutable=None):
          
          # set up the header of the new collection
          header = self._check_aligned_header(data_type, unit)
  
          # set up the values of the new collection
          values = self._check_aligned_value(value)
  
          # get the correct base class for the aligned collection (mutable or immutable)
          if mutable is None:
              collection = self.__class__(header, values, self.datetimes)
          else:
              if self._enumeration is None:
                  self._get_mutable_enumeration()
              if mutable is False:
                  col_obj = self._enumeration['immutable'][self._collection_type]
              else:
                  col_obj = self._enumeration['mutable'][self._collection_type]
              collection = col_obj(header, values, self.datetimes)
          collection._validated_a_period = self._validated_a_period
          return collection
docs: Return a Collection aligned with this one composed of one repeated value.
  
          Aligned Data Collections are of the same Data Collection class, have the same
          number of values and have matching datetimes.
  
          Args:
              value: A value to be repeated in the aliged collection values or
                  A list of values that has the same length as this collection.
                  Default: 0.
              data_type: The data type of the aligned collection. Default is to
                  use the data type of this collection.
              unit: The unit of the aligned collection. Default is to
                  use the unit of this collection or the base unit of the
                  input data_type (if it exists).
              mutable: An optional Boolean to set whether the returned aligned
                  collection is mutable (True) or immutable (False). The default is
                  None, which will simply set the aligned collection to have the
                  same mutability as the starting collection.