Subject: Re: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

From: Stefan Monnier <[email-masked]>
Date: Thu, 02 Jul 2020 11:49:04 -0400

> Conses are mutable and thus each have their own identity. Numbers are
> immutable and have none; there is no defined way to distinguish two numbers
> that have the same value ('eq' does not give well-defined results).

Better yet, there's still hope that we change things such that `eq`
behaves like `eql` on bignums (and maybe also on floats).

        Stefan