Pure-perl modules are generally compatible. Modules that are part XS need to be recompiled for the newer version, the minor version jump from 6 to 8 indicates this.

This is documented somewhere, but I cannot find it anymore.

In reply to Re: compatibility between 5.8 and 5.6 by Anonymous Monk
in thread compatibility between 5.8 and 5.6 by aravindt

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