https://github.com/theforeman/foreman/blob/1.21.0/webpack/assets/javascripts/foreman_tools.js#L135
https://github.com/theforeman/foreman/blob/1.21.0/webpack/assets/javascripts/foreman_tools.js#L70

They should not use default version parameter since you always need to think about when it'll be deprecated. We deprecate over 2 releases so that means after the next version is released you'd need to update all invocations anyway if you want to update the default.