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
Saran Tunyasuvunakool