Is your feature request related to a problem or challenge? Please describe what you are trying to do.

• @mbrobbel added extension type support in Add ExtensionType trait and CanonicalExtensionType enum #5822

However, it is still marked as "Experimental" as can be seen in the docs:

https://docs.rs/arrow-schema/55.2.0/arrow_schema/extension/index.html

Is still marked as experimental in the documentation: https://docs.rs/arrow-schema/55.2.0/arrow_schema/extension/index.html

As people begin to try to use this feature, (for example see this discussion in discord ) it would be great to have this documented

Describe the solution you'd like

I would like to make the extension type mechanism non experimental so it can get broader use

Describe alternatives you've considered

Additional context

• This will likely be needed for parquet variant support too: [EPIC] [Parquet] Implement Variant type support in Parquet #6736