1 files changed, 4 insertions, 4 deletions

diff --git a/src/_props.scss b/src/_props.scss
index b0b02c3..42f866e 100644
--- a/src/_props.scss
+++ b/src/_props.scss
@@ -15,7 +15,7 @@
     @return true;
 }
 
-@function def($name, $value: (), $metadata: null) {
+@function def($name, $value: (), $metadata: ()) {
     @return ('prop-ref' $name $value $metadata);
 }
 
@@ -92,13 +92,13 @@
     }
 }
 
-@mixin materialize($ref, $match-meta: nil) {
+@mixin materialize($ref, $match-meta: null) {
     @if is-prop-ref($ref) {
         $name:  list.nth($ref, 2);
         $value: get(list.nth($ref, 3));
         $meta:  get(list.nth($ref, 4));
 
-        @if $match-meta == nil or $meta == $match-meta {
+        @if $match-meta == null or list.index($meta, $match-meta) != null {
             @include materialize-helper($name, $value);
         }
     } @else if meta.type-of($ref) == 'list' {
@@ -108,7 +108,7 @@
                 $value: get(list.nth($r, 3));
                 $meta:  get(list.nth($r, 4));
         
-                @if $match-meta == nil or $meta == $match-meta {
+                @if $match-meta == null or list.index($meta, $match-meta) != null {
                     @include materialize-helper($name, $value);
                 }
             }