Unified Hyphen in [Hexadecimal numeric character references]

[KiyanYang]

commonmark-spec/spec.txt

Lines 676 to 680 in 796666d

	[Hexadecimal numeric character
	references](@) consist of `&#` +
	either `X` or `x` + a string of 1-6 hexadecimal digits + `;`.
	They too are parsed as the corresponding Unicode character (this
	time specified with a hexadecimal numeral instead of decimal).

The hyphen in paragraph about Hexadecimal numeric character references, which different from other places. So I suggest to change a string of 1-6 hexadecimal digits into a string of 1--6 hexadecimal digits. Here are examples of other locations:

commonmark-spec/spec.txt

Lines 661 to 667 in 796666d

	[Decimal numeric character
	references](@)
	consist of `&#` + a string of 1--7 arabic digits + `;`. A
	numeric character reference is parsed as the corresponding
	Unicode character. Invalid Unicode code points will be replaced by
	the REPLACEMENT CHARACTER (`U+FFFD`). For security reasons,
	the code point `U+0000` will also be replaced by `U+FFFD`.

commonmark-spec/spec.txt

Lines 1099 to 1109 in 796666d

	An [ATX heading](@)
	consists of a string of characters, parsed as inline content, between an
	opening sequence of 1--6 unescaped `#` characters and an optional
	closing sequence of any number of unescaped `#` characters.
	The opening sequence of `#` characters must be followed by spaces or tabs, or
	by the end of line. The optional closing sequence of `#`s must be preceded by
	spaces or tabs and may be followed by spaces or tabs only. The opening
	`#` character may be preceded by up to three spaces of indentation. The raw
	contents of the heading are stripped of leading and trailing space or tabs
	before being parsed as inline content. The heading level is equal to the number
	of `#` characters in the opening sequence.

commonmark-spec/spec.txt

Lines 2993 to 2994 in 796666d

	An HTML block of types 1--6 can interrupt a paragraph, and need not be
	preceded by a blank line.

commonmark-spec/spec.txt

Lines 4106 to 4110 in 796666d

	An [ordered list marker](@)
	is a sequence of 1--9 arabic digits (`0-9`), followed by either a
	`.` character or a `)` character. (The reason for the length
	limit is that with 10 digits we start seeing integer overflows
	in some browsers.)

[wooorm]

I’d personally prefer to use unicode characters in the spec, rather than ancient ASCII-era typewriter pseudocharacters 😅

[jgm]

Yes, it should indeed be an -- which will turn into an en dash in the rendered version.