bug#56255: 28.1.50; sxhash-equal does not change when object is modified

[Ihor Radchenko <yantar92@gmail.com>]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Ihor Radchenko <yantar92@gmail.com> writes:
>
>> Off topic: Do you know any other way to detect if deeply nested object
>> has changed (other than creating a deep copy and using equal)?
>
> Printing the object to a buffer and then using `buffer-hash' should be
> OK for most structures, but would be very slow for large objects.

This is exactly the problem at hand. I was hoping to find a fast way to
detect if a large deeply nested object is changed. If not, do not print
that object for the purpose of saving it to disk cache. Printing can
take up to 2-3 seconds in some cases.

Best,
Ihor