I would raise this thread in the Tableau GitHub space under the Web Data Connector space. Reviewing the issue, I believe it aligns with the following issue already raised in the GitHub space: Errors loading schemas · Issue #115 · tableau/webdataconnector · GitHub
Hope this helps!
Thank you for your response. I think my problem has other nature - I had data object with some properties and one of them was a collection (list / array) of some primitive type like float. Talbeau was throwing an error while getting such data because it expects data in the table form, so column type must be defined exactly as one of tableau.dataTypeEnum type, no collections of those tableau.dataTypeEnum type are allowed for this moment. In result I needed to invide ma data to two tables - first with normal properties and the second designed as table of mentioned collection property and joining them by some key in Tableau desktop app.
I decided to submit an idea of new feature - defining array of tableau types, so you can promote me idea here: https://community.tableau.com/ideas/8068
That is a great idea that I am sure will gain traction quickly. Feel free to share the idea whenever you see relevant as the more votes it has the better chance for it to be included in an upcoming release of the WDC.