Comment 2 for bug 815239

Specifically, it tries to join

 s32.5-85.499-4-128.999
 c0 0 14.001 22.833 15.834 42.333

into

 s32.5-85.499-4-128.999
 14.001 22.833 15.834 42.333

which apparently doesn't have the same effect.

There's a tiny missed optimization opportunity in there too;

 c0 0-10.251 7.166-3.583 14.416
 c6.666 7.25 29.333 31.666 56.083 33.916

can legally omit the second "c".