In principle, two separately developed packages could use the same class
name, and a user could then attach both and attempt to use methods for
both classes.
That has never worked, but some changes have been added to r-devel to
handle this case. The changes involve extending the "signature" class
to include package information. For compatibility, packages will need
to be re-installed from a version of R labelled 56466 or later, although
an attempt is made to fill in missing information.
John
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