try to address hashing/equality problems and fix caches

4 jobs for issue77_2 in 10 minutes and 15 seconds (queued for 7 minutes and 56 seconds)
Status Name Job ID Coverage
  Test
passed test_min #162060

00:01:16

passed test_mpi #162061

00:02:27

passed test_mpi_fftw #162062

00:02:47

passed test_mpi_fftw_hdf5 #162063

00:03:43

45.0%