public boolean isConsumableError(int errorCode) {
        return consumableErrors.contains(errorCode);
    }
<p>Returns whether or not the given error code <u>may</u> be consumed by
the associated routing policy.</p>

@param errorCode The code to check.
@return True if the code may be consumed.
@see #addConsumableError(int)
messagebus/src/main/java/com/yahoo/messagebus/routing/RoutingContext.java