[Rd] preserve names in grid::unit() ?

[David Firth]

I am asking here first, rather than filing a feature request directly.  It concerns a function in the grid package, maintained by R-core.

Is there a reason why grid::unit(x, units) does not preserve the names (if such exist) from vector x?

I have a use-case where that would be helpful.  But maybe there is some obstacle that I have not thought of?

Current behaviour seems to be:

> x <- 7:9
> names(x) <- letters[1:3]
> x
a b c 
7 8 9 
> z <- grid::unit(x, "native")
> z
[1] 7native 8native 9native
> str(z)
 'simpleUnit' num [1:3] 7native 8native 9native
 - attr(*, "unit")= int 4
> class(z)
[1] "simpleUnit" "unit"       "unit_v2"

## Now assign names
> names(z) <- names(x)
> z
[1] 7native 8native 9native
> names(z)
[1] "a" "b" "c"
> str(z)
 'simpleUnit' Named num [1:3] 7native 8native 9native
 - attr(*, "unit")= int 4
 - attr(*, "names")= chr [1:3] "a" "b" "c"

I would welcome any comments or suggestions.

Thanks -- David