Add FIXME.

Author: dlongley

lib/context.js

@@ -1319,6 +1319,7 @@ function _areTermDefinitionsEqual(d1, d2) {
     const v1 = d1[k];
     const v2 = d2[k];
     if(k === '@context') {
+      // FIXME: temporary hack, use deep comparison instead
       if(JSON.stringify(v1) !== JSON.stringify(v2)) {
         return false;
       }