Why upper bound version numbers?

[David Fox]

On Mon, Jun 6, 2016 at 11:15 PM, Herbert Valerio Riedel <hvriedel at gmail.com>
wrote:

> or even worse silent failures where the code behaves
> subtly wrong or different than expected. Testsuites mitigate this to
> some degree, but they too are an imperfect solution to this hard
> problem.
>

​It seems to me that if you have any thought at all for your library's
clients the chances of this happening are pretty insignificant.
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