Slashed zero in Lucida Grande (macOS)

I recently read "Oh, oh, zero!"
<https://tug.org/tugboat/tb34-2/tb107bigelow-zero.pdf> by Charles Bigelow,
where he mentions that Lucida Grande contains an alternative glyph for zero
that is slashed:

"In Lucida Grande, based on Lucida Sans, the numeral one is reworked with
baseline serifs but the default zero and Oh are the same as in the original
version. The Lucida Grande font also includes both slashed and dotted
versions of zero, as well as a seriffed variant of capital I, but these are
not the default forms."

Intrigued, I went poking about macOS's font book, and sure enough it's
there; but it's not accessible via the standard OpenType alternate style
sets. However you can get to it quite easily with a little lower level
glyph substitution.

Here's a patch for fontsrv
<https://gist.github.com/mariusae/d3856206297706ea90d30abc177a7100> for
macOS that substitutes the slashed zero when available. It's very pleasant
to use in practice. (Small screenshot attached.)

[image: Screen Shot 2019-04-02 at 6.35.40 PM.png]

-m.