Whoops, shouldn't have been unquoting strings stored in variables.

node.cpp

@@ -84,8 +84,8 @@ namespace Sass {
       break;
     case values:
       for (int i = 0; i < children.size(); ++i) {
-        buf << " ";
-        children[i].token.stream_unquoted(buf);
+        buf << " " << string(children[i].token);
+        // children[i].token.stream_unquoted(buf);
       }
       break;
     case rule:

test.scss

@@ -12,6 +12,7 @@ div {
     a {
       text-decoration: none;
       color: green;
+      content: "▲";
       border: 1px $blah red;
     }
     /* yet another comment that should be preserved */