This doesn't surprise me, but then I am not a fan of reference classes.
The obvious (to me) answer is to read the objects with the old code and convert
them to the new format on the fly or save the data in a more neutral format
like csv or json for later use.
A bunch of .rdata is on the disk, created from reference classes (as in
setRefClass()). I redefined some of the classes--not by much. Now when
I read in the rdata it seems to have been damaged, because some parts
have disappeared. The data are generally a graph of objects, some of
which (e.g.,
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