Does AsciiDoc officially supoorts Setext style headers?
I see that headers in AsciiDoc are described as titles. But I can't find any information about Setext style support like below:
A First Level Header
====================
A Second Level Header
---------------------
However, the above headers are both valid in online preview and AsciiDoc visual studio code extension. My question is, is this Setext style header officially supported in AsciiDoc, or just some untold feature added for Markdown compatibility?