Make sure valueCheck treats @value, @type, and @language as arrays.

Author: gkellogg

lib/frame.js

@@ -603,9 +603,9 @@ function _valueMatch(pattern, value) {
   const v1 = value['@value'];
   const t1 = value['@type'];
   const l1 = value['@language'];
-  const v2 = pattern['@value'] || [];
-  const t2 = pattern['@type'] || [];
-  const l2 = pattern['@language'] || [];
+  const v2 = pattern['@value'] ? [].concat(pattern['@value']) : [];
+  const t2 = pattern['@type'] ? [].concat(pattern['@type']) : [];
+  const l2 = pattern['@language'] ? [].concat(pattern['@language']) : [];
 
   if(v2.length === 0 && t2.length === 0 && l2.length === 0) {
     return true;