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

[Lars Ingebrigtsen]

Ihor Radchenko <yantar92@gmail.com> writes:

> The original idea was to detect changed objects in most generic way, as
> a part of persistent storage library. Oh well.

We could make SXHASH_MAX_DEPTH into a defvar -- or pass the depth in to
`sxhash-equal'.  However, the hash it's computing is geared towards hash
tables, so collisions are OK -- it's not a cryptographic hash, so I'm
not sure it would fit your use case anyway.  I.e., our sxhash_combine is
very simple.

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