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

[Lars Ingebrigtsen]

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.

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