f9f7827a64
For attributes which accept variable-length inputs. Currently used for `gainprm, biasprm, friction, solref, solimp` Example: - Saved before: `biasprm="0 -3 -4 0 0 0 0 0 0 0"`. - Saved after: `biasprm="0 -3 -4"`. PiperOrigin-RevId: 607609550 Change-Id: I0501348280663867693175236872e2aabc703601