Method realThis

rhino/src/main/java/org/mozilla/javascript/NativeMap.java:269–276

(Object thisObj, String name)

    }

    private static NativeMap realThis(Object thisObj, String name) {
        NativeMap nm = LambdaConstructor.convertThisObject(thisObj, NativeMap.class);
        if (!nm.instanceOfMap) {
            // Check for "Map internal data tag"
            throw ScriptRuntime.typeErrorById("msg.incompat.call", name);
        }
        return nm;
    }

    /**
     * Extracts the key from the first args entry if any and takes care of the Delegator. This is