[metapost] Bug with "odd" primitive?

[Boguslaw Jackowski]

> Test program:
>
>    show(odd -3); end

Thank you for spotting such a nasty bug.

Bug seems to be pretty old, although a "prehistorical" version of MP
yields the correct result:

   This is MetaPost, Version 0.901 (Web2c 7.5.5) (mem=mpost0901 2013.8.14)
   2 SEP 2014 17:05
   **mpost0901test.mp
   (mpost0901test.mp
   >> true )

Cheers -- Jacko


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