<===> input.scss
foo {
  foo: 3 - "bar";
  foo: (3 - "bar");
  foo: 3 / "bar";
  foo: (3 / "bar");
}

<===> output.css
foo {
  foo: 3-"bar";
  foo: 3-"bar";
  foo: 3 / "bar";
  foo: 3/"bar";
}

<===> output-dart-sass.css
foo {
  foo: 3-"bar";
  foo: 3-"bar";
  foo: 3/"bar";
  foo: 3/"bar";
}