Different-registries error after pickle dump-load

[jbriales]

I have saved a pint Quantity into a file with pickle.dump(...) then loaded it in a different program execution with pickle.load(...).
In both program executions I create the UnitRegistry in exactly the same way.
However, when comparing or mixing a Quantity that is obtained from the .pkl file via pickle.load(...) and a Quantity that is created in the current program execution via the UnitRegistry, I get the error:

ValueError: Cannot operate with Unit and Unit of different registries.

Following the instructions in the tutorial,
my understanding is that in this circumstances everything should work fine. What may be the problem or my misunderstanding?

[hgrecco]

You need to set the application registry. We are currently reworking this to make it more user friendly,.

[jbriales]

Set the application registry how?
My current two lines are

from pint import UnitRegistry
units = UnitRegistry(auto_reduce_dimensions=False)

then use units everywhere. Also, what's the best way to keep track of any updates to the API affecting this? (I would like to replace some hacks I did to deal with this when possible).
Basically, the hack I did for now was value = units.Quantity.from_tuple(value.to_tuple())

[iankharris]

After some digging, it looks like this is very straightforward:
pint.set_application_registry(ureg)

[hgrecco]

This should be fixed in master.