boost.asio: random_access_file, io_uring and thread safety

Hello,

random_access_file is backed by the io_uring kernel interface on Linux.

However, It is still unclear from Boost.Asio documentation, whether
simultaneous parallel async_write_at in-flight requests are permitted
by Asio?
The queue of simultaneous requests is natively supported by io_uring.
Is it still true for Asio?

Is it also safe to fire parallel async_write_at from different threads?

-- 
With best regards,
Matwey V. Kornilov