code: def biggus_chunk(chunk_key, biggus_array, masked):
          
          if masked:
              array = biggus_array.masked_array()
          else:
              array = biggus_array.ndarray()
  
          return biggus._init.Chunk(chunk_key, array)
docs: A function that lazily evaluates a biggus.Chunk. This is useful for
          passing through as a dask task so that we don't have to compute the
          chunk in order to compute the graph.