Arc segment is parsed incorrectly

[subzey]

According to the spec, arc segments features flags: a fixed value 0 or 1. These flags are currently parsed as a number by svgo. This approach is more forgiving, but it's also a reason svg can be parsed incorrectly.

For example, an arc a1 1 0 001 1:

	Rx	Ry	rot	large arc	sweep	x	y
Spec	1	1	0	0	0	1	1
svgo	1	1	0	001	1

As a result, svgs with comma-wsp? omitted after any of the flags makes svgo crash or produce incorrect results. This file is displayed correctly in all browsers and IE11+, but is broken after svgo 1.0.1.

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 7 7">
  <path d="
    m 0 0
    a 1 1 0 001 1
      1 1 0 001 1
      1 1 0 001 1
      1 1 0 001 1
      1 1 0 001 1
      1 1 0 001 1
      1 1 0 001 1
  "/>
</svg>

[GreLI]

Thanks, that's interesting!