Fractional coordinates in Hair about fira

[patrykdesign]

HAIR is experimental, but thanks for letting me know, I'll put it on our fix list.

[patrykdesign]

We'll try to address this in the next update, likely Q1 2015.

[patrykdesign]

Below is an explanation on why HAIR is the way it is...
Fira Sans Hair is not the thinnest weight.
The thinnest Master is at 2 em. Fira Sans Hair (14 em) is interpolated between this Master and the Light Master (30 em). So yes, this is an integer – but the result of a controlled interpolation, not an extrapolation.

All top nodes of the mentioned glyphs are constantly at 680,85. It could be that the renderer doesn’t catch the points because caps height is at 681.
The decision was to start rounding interpolation values at 22 em; that corresponds to the weight „Thin“.
As for that, all weights below Thin are using fractional values.
Reason is that bevels and crucial points (i.e. connections) look better if they are interpolated exactly and rounding doesn’t affect the proportions as much if the weight get a bit bolder.

You could use Fira Thin (22 em) if you think the rendering results of Fira Hair (14 em) don’t work for the font sizes you intended.
In general, these hairline weights are technically still experimental because renderer can’t handle integer values yet. That’s why they were marked red in the version report.
Please see them as a gimmick if you want to play around with huge letters. They are not intended as perfectly rendered text fonts in text sizes.

[patrykdesign]

So this likely won't be fixed.