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

[Andrea Corallo]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> What's your suggestion on this optimization? Do you think can be on with
>> default settings or is it dangerous?
>
> AFAICT it's been on since Emacs-21, which seems to argue for "not too 
> dangerous".

Great, thanks both for your suggestions.

BTW IMO if the only way to *certainly* get a mutable string is with
`copy-sequence' or `make-string' I think we could document it.  Is a
simple rule easy to understand and clarifies the situation.

  Andrea

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