Make suggested changes.

Author: gkellogg

lib/compact.js

@@ -649,7 +649,7 @@ api.compactIri = ({
   for(let i = partialMatches.length - 1; i >= 0; --i) {
     const entry = partialMatches[i];
     const terms = entry.terms;
-    for(let term of terms) {
+    for(const term of terms) {
       // a CURIE is usable if:
       // 1. it has no mapping, OR
       // 2. value is null, which means we're not compacting an @value, AND

lib/context.js

@@ -492,8 +492,8 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
         'jsonld.SyntaxError',
         {code: 'invalid term definition', context: localCtx});
     }
-    if(value['@prefix'] === true || value['@prefix'] === false) {
-      mapping._prefix = value['@prefix'] === true
+    if(typeof value['@prefix'] === 'boolean') {
+      mapping._prefix = value['@prefix'] === true;
     } else {
       throw new JsonLdError(
         'Invalid JSON-LD syntax; @context value for @prefix must be boolean',