I suppose that, by extension, this means that a factor of #0.0
means the layout would have no spacing at all, and all glyphs
would be engraved over the top of each other in one big blob, and
a factor of #-1.0 would mean that the glyphs are engraved
normally, but spaced right-to-left. For the sake of
reasonableness/sanity, perhaps Lily might just disallow factors<
or perhaps even<= 0, unless someone can make a compelling use
case for non-positive spacing factors.
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