Fix protected redefinition of equivalent id terms.

- Fix test `pr41` of protected redefinition of equivalent id terms.
- The `String.match` logic and expression like `(true && null)` was
  evaluating to `null` which later failed a strict comparison with
  `false`. Fixed by forcing boolean logic.

Author: davidlehn

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Fix handling of graph property with empty array.
 - Fix safe mode for `@graph` use cases.
   - Check all elements of graph property with array.
+- Fix test `pr41` of protected redefinition of equivalent id terms.
 
 ## 8.2.0 - 2023-05-19
 

lib/context.js

@@ -708,7 +708,7 @@ api.createTermDefinition = ({
       // indicate if this term may be used as a compact IRI prefix
       mapping._prefix = (simpleTerm &&
         !mapping._termHasColon &&
-        id.match(/[:\/\?#\[\]@]$/));
+        id.match(/[:\/\?#\[\]@]$/) !== null);
     }
   }