Add _get_obs to fast environment #644
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Hello,
fastenv is designed as a minimalistic env for fast unit testing. However, it does expose a_get_obsmethod like the other brax environments. This breaks tests that users could create (at least I did) that rely on this method, while those tests would work for other brax environments (at the expense of a much slower test time).I propose adding a
_get_obsmethod tofastenv to more accurately reflect the structure of brax environments.I believe the current test suite covers this feature, please correct me if I am wrong.