Escape comma in mixin parameters?

I just wanted to use mixin for animation-name property

@define mixin animations $names { animation-name: $names; }
// ... 
@mixin animations first, second

it seems that it's not possible?

Line 49 in 80994ee

params = postcss.list.comma(rest);

ahh sorry just figured out to use variables

@define mixin animations $names { animation-name: $names; }
// ... 
$foo-names: first, second;
// ...
@mixin animations $foo-names;

Closing now since this issue is not really related to current project