Posted by brianrepko on Mar 15, 2017; 12:40am
URL: https://discuss.asciidoctor.org/Table-include-macro-tab-delimited-files-tp5374p5382.html

Thanks Dan - I was clearly reading old asciidoc doc (thus my mention of the `include1` macro above).
All great to know, I'll embedding the tab character in the document as separator for now and will watch the issue above (thanks for creating that).