Are there other implicit index files supported?

I can’t find this in docs and curious if there is support for index files other than index.html ?

That is /directory/index.html is automatically available as /directory/

Would /feed/index.xml be available as /feed/ with correct XML headers and such? Any other kind of index file?

This is initially prompted by Hugo having feeds at index.xml and needing to serve them at /feed/ endpoints.

I know that can be done with redirect/rewrite (which I currently do), but this got me interested are there any other index files supported, or is it only index.html.

this is an interesting question, @Rarst. I will try and get some extra eyes on this to get more information.