Incorrectly output integers as float is precision is 0

[xzyfer]

Originally reported in #1140 (comment)

$foo: 123px; 
foo { 
  bar: $foo; }

Libsass with precision 0

foo{
  bar: 123.0px; }

Ruby Sass with precision 0

foo{
  bar: 123px; }

[mgreter]

Once again, the logix seems to be more complicated then anticipated and again not sure if wanted behavior or just a ruby sass bug? //cc @xzyfer

input.css

foo { 
  bar: (0);
  bar: (.0);
  bar: (0.0);
  bar: (-0);
  bar: (-.0);
  bar: (-0.0);
  bar: (42);
  bar: (-42);
  bar: (43.0);
  bar: (-43.0);
  bar: (44.0000);
  bar: (-44.0000);
  bar: (45.00001);
  bar: (-45.00001);
  bar: (42.84);
  bar: (-42.84);
  bar: (42.24);
  bar: (-42.24);
  bar: (42.845555);
  bar: (-42.845555);
  bar: (42.245555);
  bar: (-42.245555); }

Ruby sass output:

foo {
  bar: 0;
  bar: 0;
  bar: 0;
  bar: 0;
  bar: 0;
  bar: 0;
  bar: 42;
  bar: -42;
  bar: 43;
  bar: -43;
  bar: 44;
  bar: -44;
  bar: 45.0;
  bar: -45.0;
  bar: 43.0;
  bar: -43.0;
  bar: 42.0;
  bar: -42.0;
  bar: 43.0;
  bar: -43.0;
  bar: 42.0;
  bar: -42.0; }

Seems to be a special case if the value was actually rounded. IMO we have a similar expection already in that function, so I might be able to implement it "correctly" ...

[xzyfer]

Seems to be a special case if the value was actually rounded

Yes. When I recently refactored this code I applied to "special cases" always because it was semantically equivalent and the old behaviour wasn't.

This issue specifically refers to making the special case only apply to rounded numbers.