function setNatives(on) {
        RegExp.prototype.exec = (on ? fixed : nativ).exec;
        RegExp.prototype.test = (on ? fixed : nativ).test;
        String.prototype.match = (on ? fixed : nativ).match;
        String.prototype.replace = (on ? fixed : nativ).replace;
        String.prototype.split = (on ? fixed : nativ).split;
        features.natives = on;
    }
Enables or disables native method overrides.
@private
@param {Boolean} on `true` to enable; `false` to disable.