// For purposes of this definition, the beginning and the end
	// of the line count as Unicode whitespace.”
	leftFlank := !isUnicodeSpace(after) &&
		(!isUnicodePunct(after) || isUnicodeSpace(before) || isUnicodePunct(before))

	// “A right-flanking delimiter run is a delimiter run that is
	// (1) not preceded by Unicode whitespace, and either
	// (2a) not preceded by a Unicode punctuation character, or