strongUnderscoreItem method
Implementation
Parser<InlineNode> strongUnderscoreItem() => seq2(
string('__').not(),
[
ref0(codeSpan),
ref0(strikethrough),
ref0(emphasis),
ref0(escapedCharNode),
ref0(strongUnderscoreTextRun),
ref0(singleSpecialChar),
].toChoiceParser(),
).map2((_, node) => node);