ben-schwen commented on PR #45346:
URL: https://github.com/apache/arrow/pull/45346#issuecomment-2613683879

   > > "Safe option" would be not to drop the `data.table` class but only drop 
the `.internal.selfref` attribute, so `data.table` will detect that and 
allocate the right memory.
   > 
   > I thought that's what we're already doing, so maybe I misunderstand the 
original report.
   
   I consider the initial report as WAI, although our warning could be better 
since we also warn about the serializing case when `saveRDS` and subsequent 
`readRDS`. 


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