Interpreting compressed SVG path command syntax

Question

I'm working with compressed SVG path data which has been output from SVGO, and I can't understand one part of a relative line-to command. The path itself looks like this (it's a triangle, and it displays correctly):

<path d="M2107.49 3283.96l70.68 81.44 28.54-81.69-99.22.25z"/>

Pulling apart the d attribute into commands, we get:

M: (Start coords) 2107.49 3283.96
l: (Relative line to coords) 70.68 81.44 28.54-81.69-99.22.25
z (close)

The piece I don't understand is the last 'pair' of the line-to commands: From what I understand, we should have 3 pairs of coordinates, which are either separated by a space 70.68 81.44, or where negative, no space: 28.54-81.69 = 28.54, -81.69. But what's going on in that last 'pair'? Does -99.22.25 represent -99.2 and 2.25? How would I know how to split that?

SVGO is trying to squeeze every last byte out of its compression, so it's possibly taking advantage of some implied parsing rule I can't find a reference to. Does anyone know how to deal with that last pair?

Answer 1

Per the BNF in the SVG specification

...

Similarly, for the string "M 0.6.5", the first coordinate of the "moveto" consumes the characters "0.6" and stops upon encountering the second decimal point because the production of a "coordinate" only allows one decimal point. The result is that the first coordinate will be "0.6" and the second coordinate will be ".5".

So -99.22.25 is -99.22 followed by .25