wrong replacement of values in function unfactor()

R 3.4.2, varhandle 2.0.2

example:

df <- data.frame(postcode=c(rep("01234", 5), rep("09876", 5)), inhabitant=c(rep(30000, 5), rep(100000, 5)), stringsAsFactors=TRUE)

str(df)

'data.frame': 10 obs. of 2 variables: $ postcode : Factor w/ 2 levels "01234","09876": 1 1 1 1 1 2 2 2 2 2 $ inhabitant: num 30000 30000 30000 30000 30000 100000 100000 100000 100000 100000

unfactor(df)

Warning in [<-.data.frame(*tmp*, , factor_columns_indecies, value = list( : provided 10 variables to replace 1 variables

.. postcode inhabitant
1 1234 30000
2 1234 30000
3 1234 30000
4 1234 30000
5 1234 30000
6 1234 100000
7 1234 100000
8 1234 100000
9 1234 100000
10 1234 100000

All values in column postcode are replaced by only one value.

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