MORecordEpisodeStatistics return scalars when not VecEnv #30
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Fix #28
The wrapper was wrapping all infos in numpy arrays (like time and episode length), even when the environments where not vectorized. This didn't make sense and was a behaviour change compared to 0.2.1. Hence the revert here.
Note: this is not the current behaviour of Gymnasium (they do return numpy arrays, hence our behaviour change), but they will change it in the future.