[Larceny-users] Random data stored by bytevector-set! if the value to store is any non-fixnum

[Felix S Klock II (Larceny-users list proxy)]

Lars (cc'ing larceny-users)-

I will copy your message into a comment on the ticket.

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Cheers,
-Felix

On Sun, Jul 15, 2012 at 3:46 PM, Lars T Hansen <lth at acm.org> wrote:
> The following is probably related in some way to
> https://trac.ccs.neu.edu/trac/larceny/ticket/342, but I don't know
> that I have credentials to log in and comment directly.
>
> Larceny 0.97 on Windows, running under Cygwin:
>
> $ larceny.bin
> Larceny v0.97 "Funny in the Head" (Aug 19 2009 14:35:39, precise:Win32:unified)
>
>> (define x (make-bytevector 1))
>
>> (bytevector-set! x 0 #i0)
> #vu8(141)
>
>> (bytevector-set! x 0 #i0)
> #vu8(93)
>
> This appears to happen for other inexact values than #i0 as well, and
> for fractions such as 3/2, and indeed for any non-fixnum I've tried.
> Fixnums are truncated.
>
> Almost any behavior would be more useful than storing random data
> here.  The context in which I ran into this problem would have liked
> for the improved behavior to be an error message, and judging from the
> behavior of eg fx+ on inexacts I suspect that is probably most in
> keeping with the language as a whole, but that's just a suggestion.
>
> --lars
>
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