<===> input.scss
test {
  foo: 0.4999 round(0.4999);
  bar: 0.49999 round(0.49999);
  baz: 0.499999 round(0.499999);
  baz: 0.49999999999 round(0.49999999999);
}

<===> output.css
test {
  foo: 0.4999 0;
  bar: 0.49999 0;
  baz: 0.499999 0;
  baz: 0.5 0;
}