Major problem with keyframes and 0% and animation 0s

[Julieng50]

Hi !
Using minifyCss :

@keyframes bug-example {
  0% { ... }
  100%{ ... }
}

is converting to :

@keyframes bug-example {
  0 { ... }
  100%{ ... }
}

But "0" in keyframes is ignored by firefox

[Julieng50]

Same for
animation: stroke .5s forwards 0s;

converted to :
animation: stroke .5s forwards 0;

This should not happened