mutate calls strip custom attributes on dataframes

[davidski]

A possible duplicate/extension of #3259, mutate calls strip out custom attributes on dataframes.

suppressPackageStartupMessages(library(dplyr))
dat <- mtcars
attr(dat, "hello") <- "world"
names(attributes(dat))
#> [1] "names"     "row.names" "class"     "hello"

dat <- mutate(dat, "foo" = "bar")
names(attributes(dat))
#> [1] "class"     "names"     "row.names"

Created on 2018-06-18 by the reprex package (v0.2.0).

[hadley]

Duplicate of #3429

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/