Handling of Setext heading content is underspecified

[mgeier]

http://spec.commonmark.org/0.27/#setext-headings:

The contents of the heading are the result of parsing the preceding lines of text as CommonMark inline content.

http://spec.commonmark.org/0.27/#paragraphs:

The contents of the paragraph are the result of parsing the paragraph’s raw content as inlines. The paragraph’s raw content is formed by concatenating the lines and removing initial and final whitespace.

I assume that the rules should be the same for both cases, and http://spec.commonmark.org/0.27/#example-53 hints into this direction, but the information about removing whitespace is still missing in the description of Setext headings.

Probably there could be a formal definition of "inline content" which both blocks (and probably others) could use?