 matter if you use a stable release version of Stan or the
version with a particular Git hash tag. The same goes for all of the
interfaces, compilers, and so on. The point is that if any of
these moving parts changes in some way, floating point results may
change.</p>
<p>Concretely, if you compile a single Stan program using the same
CmdStan code base, but changed the optimization flag (<code>-O3</code> vs. <code>-O2</code>
or <code>-O0</code>), the two programs may not return the identical stream of
resul