Mathematical signs are misaligned

[alerque]

As noted in this issue on the TypeNetwork fork, mathematical symbols could use a little bit of alignment (and stroke weight) help. Most egregiously ‘+’ is hitched to a hot air balloon and sailing high, but lots of other minor issues are visible.

SILE Test Code

\begin{document}
\nofolios
\neverindent
\font[family=Raleway,size=32pt]
\begin{raggedright}
\begin{script}
local str = "1×<>+÷−¬=≠±≤≥3"
for _, features in ipairs({ "", "+lnum" }) do
	for _, weight in ipairs({100, 200, 300, 400, 500, 600, 700, 800, 900}) do
		SILE.call("font", { weight = weight, features = features }, function ()
			SILE.typesetter:typeset(str)
			SILE.call("hfill")
			SILE.call("font", { style = "Italic" }, { str })
			SILE.call("break")
		end)
	end
end
\end{script}
\end{raggedright}
\end{document}

(Shown with +onum and +lnum.)

CC: @thlinard who seems to be on a crusade on this topic 😉

[alerque]

ALso with lines at baseline, x-height, and half way between:

SILE Test Code

\begin{document}
\nofolios
\neverindent
\script[src=packages/grid]
\font[family=Raleway,size=16]
\grid[spacing=1ex]
\grid:debug
\font[family=Raleway,size=32]
\begin{raggedright}
\begin{script}
local str = "1×<>+÷−¬=≠±≤≥3"
for _, features in ipairs({ "", "+lnum" }) do
	for _, weight in ipairs({100, 200, 300, 400, 500, 600, 700, 800, 900}) do
		SILE.call("font", { weight = weight, features = features }, function ()
			SILE.typesetter:typeset(str)
			SILE.call("hfill")
			SILE.call("font", { style = "Italic" }, { str })
			SILE.call("break")
		end)
	end
end
\end{script}
\end{raggedright}
\end{document}