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Inversion is a tool for testing version numbers on Emacs Lisp packages, and can be found as a part of the CollectionOfEmacsDevelopmentEnvironmentTools.
The latest version of Inversion can be downloaded from CVS:
You can use inversion to load in a lisp package, as such:
(inversion-require 'packagesym "1.0")
If you have a package that breaks backward compatibility, you can specify an incompatible version number so that others using inversion can safely specify older versions that they require, for example:
(defvar mypackage-incompatible-version "0.1alpha1")
If you own a package, you can use inversion to put revision numbers in your output files (such as with EmacsLispObjects save files) to flush incompatible changes.