This will stash all modifications that you did not git add:

git stash -k

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
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Read more Show archive.org snapshot

Note that newly created (and non-added) files will remain in your working directory unless you also use the -u switch.

git stash -k -u

Also, your working directory must be clean (i.e. all changes need to be added) when you git stash pop later on.