saving std.random RNG state

[harfel]

I am looking for a way to serialize/deserialize the state of the 
std.random.Random number generator, ideally using orange 
(https://github.com/jacob-carlborg/orange) or another 
serialization library. From looking at the module source code, I 
understand how to seed a random number generator with the state 
of another, but I do find a way to access the RNG's state, since 
it is hidden away in a private attribute. What is the recommended 
solution for this? Thanks in advance!