Runtime Animation Mirroring

Animation mirroring is a big topic because you have to make it working runtime without asset changing, only a bone list to link left and right bones.
It’s a big topic I never found answer and I hope here the mystery can be killed.
The easy way explained in this link is not a valid solution :
The problem is the bone space, when you mirror the bone you got problems fastly.
Someone has a valid solution on this problem ?
Thanks for the help

Go vote for it here - I really want this too

I have voted, but, if it’s possible to have more than just “It’s added !” since it’s a real mystery for me to have that working good.
It could be very cool to have the answer.
Thanks for the help