al to each other
according to <a href="dart-ui/RRect/operator_equals.html">operator ==</a>.
The hash code of an object should only change if the object changes
in a way that affects equality.
There are no further requirements for the hash codes.
They need not be consistent between executions of the same program
and there are no distribution guarantees.</p>
<p>Objects that are not equal are allowed to have the same hash code,
it is even technically allowed that all instances have the same hash code,
but if c