I'm a contributor to the atom-beautify package, which uses sass-convert to beautify SASS files. I noticed an issue with our CI builds where converting sass to sass doesn't remove redundant spaces between commas and doesn't add a space after a commas if it's missing in version 3.5.4. Consider the below before and after code when I run sass-convert from and to sass. Notice that html,body doesn't have a space after the comma, and ul, ol has three spaces instead of one. I uninstalled 3.5.4 and tried 3.5.3 and it did take care of the spaces.
Before
nav
ul
padding: 0
margin: 0
list-style: none
li
display: inline-block
a
display: block
text-decoration: none
padding: 6px 12px
html,body,
ul, ol
margin: 0
padding: 0
After
nav
ul
padding: 0
margin: 0
list-style: none
li
display: inline-block
a
display: block
text-decoration: none
padding: 6px 12px
html,body,
ul, ol
margin: 0
padding: 0
From https://github.com/sass/sass/issues/2422: