Function logos_rt_list_own 

pub unsafe extern "C" fn logos_rt_list_own(
    frame: *mut i64,
    handle_slot: i64,
    vec_slot: i64,
    ptr_slot: i64,
    len_slot: i64,
)

Copy-on-write: give the list in frame[handle_slot] its own registry-owned buffer — a copy of the shared one — and re-plant the register’s handle and pin triple on it. The native twin of the VM’s first write to a shared list; the original (a parameter’s, or a caller’s through a passthrough) is untouched from here on.

Safety

frame[handle_slot] must be a live *mut Vec<i64>.