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Re: master ea93326: Add `union' and `intersection' to rx (bug#37849)

From: Stefan Monnier
Subject: Re: master ea93326: Add `union' and `intersection' to rx (bug#37849)
Date: Wed, 11 Dec 2019 10:10:33 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) 
>> Why not (re)use `or` instead of `union`?  IOW make it an optimization?
> It probably could, but having to explain the restrictions to the user felt
> a bit messy, so I went with a neatly closed collection of set operations
> (union, intersection and complement).

But as a user now I wonder what's the difference between `or` and
`union` and also why there has to be a difference.


        Stefan
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