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

[Andrea Corallo]

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

>> String mutation is something of a special case: it is rare, yet its mere
>> possibility incurs costs even for code that doesn't use it.
>
> Yes and no: it's *very* rare to change the sequence of characters which
> compose a string, yes, but until the addition of `propertize` (in
> Emacs-21) mutation was the only way to add text-properties to a string,
> so it's still quite common.

Hi Stefan,

What's your suggestion on this optimization? Do you think can be on with
default settings or is it dangerous?

  Andrea

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