f0bb7467a3
This PR added necessary annotations, following what we did for mjData and mjModel for length of the given array. This is useful because my parser used to generate Swift interface: https://github.com/liuliu/swift-mujoco/blob/main/Sources/codegen/main.swift#L297 such that the access to underlying array is bound-checked. Please let me know if this makes sense. After this change, I can successfully generate all mj* struct interfaces in Swift without problem (with notable exception of mjui): https://github.com/liuliu/swift-mujoco/tree/main/Sources