71c5f1794d
Since the introduction of arena memory, these fields now have dynamic sizes that change between time steps depending on the number of active constraints. This breaks strict correspondence between joints and `efc_` rows. Note that these fields can still be accessed directly as attributes on the `MjData` object. PiperOrigin-RevId: 508342388 Change-Id: I610ae6ca462f6bb5cf8bc199a3436bed3d1a5371