Description:

The Perl garbage collector uses simple reference counting during the
normal execution of a program. This means that cycles or unweakened
references in other parts of code can keep an object around for longer
than intended. To help avoid this problem, the reference count of a
new object from its class constructor ought to be 1. This way, the
caller can know the object will be properly DESTROYed when it drops
all of its references to it.

This module provides two test functions to help ensure this property
holds for an object class, so as to be polite to its callers.

If the assertion fails; that is, if the actual reference count is
different to what was expected, a trace of references to the object is
printed, using Marc Lehmann's Devel::FindRef module.