Support more than 1 table/schema per .hyper file?

[waded]

Given the Hyper API's structure I presume a .hyper file from a .twbx URL can contain more than one schema, and more than one table per schema, but every example I tried only had one schema with one table in it ("Extract"."Extract") Perhaps this is just a result of only being able to use Tableau Public Desktop data sources, that don't seem to have an option to export as multiple tables?

So, for now, twbxless only supports a single schema & table, and returns a dataset indicating multiple schemas/tables if it encounters that, rather than arbitrarily selecting a table.

Please provide a URL for a .twbx that includes a file w/ multiple schemas, tables, or both, and we can add support for selecting schema/table.