hich is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more of the flag
constants defined below.  These flags control the rigor (and time) of
the planning process, and can also impose (or lift) restrictions on the
type of transform algorithm that is employed.
</p>
<p><em>Important:</em> the planner overwrites the input array during
planning unless a saved plan (see <a href="Wisdom.html#Wisdom">Wisdom</a>) is available for that
problem, so you should initialize your input data after creating the
plan