NEXT.pm adds a pseudoclass named 'NEXT' to any program that uses it. If a
method 'm' calls '$self->NEXT::m()', the call to 'm' is redispatched as if
the calling method had not originally been found.

In other words, a call to '$self->NEXT::m()' resumes the depth-first,
left-to-right search of '$self''s class hierarchy that resulted in the
original call to 'm'.

Note that this is not the same thing as '$self->SUPER::m()', which begins a
new dispatch that is restricted to searching the ancestors of the current
class. '$self->NEXT::m()' can backtrack past the current class -- to look
for a suitable method in other ancestors of '$self' -- whereas
'$self->SUPER::m()' cannot.