No schema prefix means any schema prefix

Just read this in (the new Writer) docs:

> If you pass just a table name, then any schema prefix in the client tables is ignored, so
> ```elixir
> Writer.allow(Todos, table: "todos")
> ```
> will match client operations for ["public", "todos"] and ["application", "todos"] etc.

Jumped out as surprising. I would have thought no-schema means public and any schema must be explicit? Or is there a reason related to the way Ecto configures schemas?