as_xxx functions should not drop names

[TimTaylor]

dat <- c(a = "2020-01-02")

# names kept
as.Date(dat)
#>            a 
#> "2020-01-02"

# names dropped
grates::as_yearweek(dat)
#> <grates_yearweek_monday[1]>
#> [1] "2020-W01"

# this should be TRUE
all.equal(
    as.Date(grates::as_yearweek(dat, 4)),
    as.Date(dat)
)
#> [1] "names for current but not for target"

^{Created on 2025-08-15 with reprex v2.1.1}

[TimTaylor]

For the return journeys should we always retain names or match the behaviour of the corresponding base functions when used on dates?