I dunno, to me that seems like all YAML's mistakes all over again. I quite like the conciseness, and significant whitespace seems like a good match here, but the double hyphen thing really seems odd to me. And the syntax is so hard to parse, apparently, that their own example is syntax highlighted incorrect, coloring content as if it's tags.
If I may ask, what made you settle on the double dash to disambiguate content from tags? Like is it some sort of nod to SGML from way back when? It seems like an odd choice to me at first glance, but I bet it was thought about long and hard so I’d love to hear some background about what alternatives you considered.
