<===> exclam/options.yml
---
:todo:
- sass/libsass#2880

<===>
================================================================================
<===> exclam/only/input.scss
a {b: url(!)}

<===> exclam/only/output.css
a {
  b: url(!);
}

<===>
================================================================================
<===> exclam/middle/input.scss
a {b: url(http://c.d/e!f)}

<===> exclam/middle/output.css
a {
  b: url(http://c.d/e!f);
}