_icons.scss in font-awesome-sass-6.1.0

- old
+ new

@@ -3,7 +3,9 @@
 
 /* Font Awesome uses the Unicode Private Use Area (PUA) to ensure screen
 readers do not read off random characters that represent icons */
 
 @each $name, $icon in $fa-icons {
-  .#{$fa-css-prefix}-#{$name}::before { content: fa-content($icon); }
+  .#{$fa-css-prefix}-#{$name}::before {
+    content: unquote('"#{ $icon }"');
+  }
 }