Should some of the material in “Numbers in Words” (or later topics) be updated? Since usage of Fixnum and Bignum constants is deprecated after Ruby 2.4.
We haven’t actually switched our curriculum to Ruby 2.4 yet, so the usage of these constants is perfectly fine for us if you’re using Ruby 2.3.1 or earlier. If you only have Ruby 2.4 installed, you can use rbenv to install and use earlier versions as well.
As a developer, you may find that you’re not always working with the latest version of a given language or library. Dev shops don’t have the time or resources to constantly update to keep up with the latest versions - they have to prioritize.
Hope this helps!