Role metadata collections schema

[trippsc2]

Hello.

I'm new to working on collections. I've mostly written local-only plugins/modules and roles in the past. I noticed that if I reference my collection in a role meta/main.yml file, I get a schema error from ansible-lint because my namespace name has a number in it.

Is there a reason that I'm not aware of that namespaces in the schema are limited to alphabet characters only? Is this a difference between the ansible-lint schema and requirements of ansible-galaxy or is there a reason why I should not use a namespace with a number in it?