> Ligatures typically change the appearance of a character, they do not change the meaning
Anyone can use a hyphen for all three purposes right now and people would understand the meaning, because the meaning is primarily derived from the context of surrounding glyphs. Only typesetters would complain that a subtly more appropriate glyph should be used for the purposes of refined optics and geometry etc.
Therefore an endash and emdash ligature could only change the meaning IF the context of each use case overlap. i.e if there is a valid glyph based context in which endash and emdash are both valid... which I don't think there is because that would be far too subtle.
Anyone can use a hyphen for all three purposes right now and people would understand the meaning, because the meaning is primarily derived from the context of surrounding glyphs. Only typesetters would complain that a subtly more appropriate glyph should be used for the purposes of refined optics and geometry etc.
Therefore an endash and emdash ligature could only change the meaning IF the context of each use case overlap. i.e if there is a valid glyph based context in which endash and emdash are both valid... which I don't think there is because that would be far too subtle.