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Hello, I'd like to report what I think is a bug: using as.data.frame() we can create duplicate row names in a data frame. R version 3.4.3 (current stable release). Rather than paste code in an email, please see the example formatted code here: https://stackoverflow.com/questions/49031523/duplicate-row-names-in-r-using-as-data-frame I posted to StackOverflow, and consensus was that we should

...specify the granularity of scheduling. * Some as.data.frame() methods, notably the matrix one, are now more careful in not accepting duplicated or NA row names, and by default produce unique non-NA row names. This is based on new function .rowNamesDF(x, make.names = *) <- rNms where the logical argument make.names allows to specify _how_ invalid row names rNms are handled. .rowNamesDF() is a "workaround" compatible default. * R has new serialization format (version 3) which supports custom serialization of ALTREP framework objects....

...specify the granularity of scheduling. * Some as.data.frame() methods, notably the matrix one, are now more careful in not accepting duplicated or NA row names, and by default produce unique non-NA row names. This is based on new function .rowNamesDF(x, make.names = *) <- rNms where the logical argument make.names allows to specify _how_ invalid row names rNms are handled. .rowNamesDF() is a "workaround" compatible default. * R has new serialization format (version 3) which supports custom serialization of ALTREP framework objects....