Fraction Slash (U+2044) in Fira Mono has negative width

[jfkthame]

In v3.106, the fraction-slash glyph has been given a negative(!) advance width. I think this is incorrect in principle — in a monospaced font, it should have the same width as all the rest of the (spacing) glyphs — and it seems likely to cause problems for software that assumes glyph widths are non-negative.

[jfkthame]

And the same applies to the division slash glyph (U+2215).

[jfkthame]

In the Fira Mono Bold face, these glyphs don't have negative width, but they're both 580 units, which is still incorrect (needs to be 600 for proper monospaced behavior).

[patrykdesign]

Fixed in 3.108