JSON roundtrip test fails with carray backend on Erlang 20

[kocolosk]

I get the following error consistently on 20.1 and 20.3; the test succeeds for me on 19.3:

hyper_test:24: hyper_test_...*failed*
in function hyper_test:'-backend_t/0-fun-9-'/1 (test/hyper_test.erl, line 132)
in call from hyper_test:backend_t/0 (test/hyper_test.erl, line 132)
**error:{assertEqual,
    [{module,hyper_test},
     {line,132},
     {expression,
         "hyper : from_json ( hyper : to_json ( Carray ) , hyper_carray )"},
     {expected,{hyper,9,{hyper_carray,#Ref<0.3017655732.2247491585.178337>}}},
     {value,{hyper,9,{hyper_carray,#Ref<0.3017655732.2247491585.178346>}}}]}
  output:<<"">>

Not sure if that's a real issue or if there simply needs to be a different equivalence test on the roundtrip.

[kocolosk]

After skimming through some of the carray code I don't see any reason why we'd expect the internal reference to be the same on a roundtrip. I also don't see any other equivalence test beyond serializing the registers again ... so maybe this particular test should just be disabled.