Why were usage category enums removed in 7.13.0?

[jiodice-tl]

I noticed after updating my Twilio package from 7.12.2 to 7.13.0 I had a bunch of build errors in my Twilio service due to enums being removed? What was the reason for removing these?

We already use the usage API daily to pull in SMS/MMS usage and carrier fees per subaccount.

One thing I am working on is adding the ability to pull fees for 10 DLC registrations, etc.
Looking at the documentation at https://www.twilio.com/docs/usage/api/usage-record#usage-all-categories
I only see one category for registration fees (a2p-registration-fees) but in the CategoryEnum class I see 8 different registration fee categories for A2P 10DLC

So how would someone new to the API know about these additional categories if they are having to go based on the documentation since it is now just a string type?