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| From: | Stefan Monnier |
| Subject: | bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? |
| Date: | Thu, 02 Jul 2020 11:49:04 -0400 |
| User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
> 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
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