fixup! refactor: Rename imported symbols

Author: ExE-Boss

Diff for: lib/constructs/interface.js

@@ -508,7 +508,7 @@ class Interface {
   generateExport() {
     this.str += `
       exports.is = function is(obj) {
-        return utils.isObject(obj) && utils.hasOwn(obj, impl) && obj[implSymbol] instanceof Impl.implementation;
+        return utils.isObject(obj) && utils.hasOwn(obj, implSymbol) && obj[implSymbol] instanceof Impl.implementation;
       };
       exports.isImpl = function isImpl(obj) {
         return utils.isObject(obj) && obj instanceof Impl.implementation;
@@ -1144,7 +1144,7 @@ class Interface {
         privateData.wrapper = obj;
 
         exports._internalSetup(obj, globalObject);
-        Object.defineProperty(obj, impl, {
+        Object.defineProperty(obj, implSymbol, {
           value: new Impl.implementation(globalObject, constructorArgs, privateData),
           configurable: true
         });