mutate destroys attributes

[AshesITR]

When using custom attributes on a data frame, they are lost upon calling mutate:

data(iris)
attr(iris, "test") # NULL
attr(iris, "test") <- "yay"
attr(iris, "test") # yay
iris <- dplyr::mutate(iris, Test = 42)
attr(iris, "test") # NULL again :(

[batpigandme]

Related #3259

[AshesITR]

Hadley closed a similar issue as duplicate of #3429.
As I understand, krmlr is working on this for the 0.9.0 release...

[lock]

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