Description:

One shortcoming of the CPAN clients that currently exist is that they
have no way of specifying conflicting downstream dependencies of
modules. This module attempts to work around this issue by allowing
you to specify conflicting versions of modules separately, and deal
with them after the module is done installing.

For instance, say you have a module Foo, and some other module Bar
uses Foo. If Foo were to change its API in a non-backwards-compatible
way, this would cause Bar to break until it is updated to use the new
API. Foo can't just depend on the fixed version of Bar, because this
will cause a circular dependency (because Bar is already depending on
Foo), and this doesn't express intent properly anyway - Foo doesn't
use Bar at all. The ideal solution would be for there to be a way to
specify conflicting versions of modules in a way that would let CPAN
clients update conflicting modules automatically after an existing
module is upgraded, but until that happens, this module will allow
users to do this manually.