Issues related to subsetting a VectorListSxp, particularly, a StrSxp

[randy3k]

@simonbyrne
I notice that when I subset a StrSxp object with multiple indexes, it returns a julia array of CharSxp's. I think most users (at least myself) is expecting a StrSxp object with the corresponding indexes.
Is there any reasons for this implementation?

julia> a = RObject(["a", "b", "c"])
RCall.RObject{RCall.StrSxp}
[1] "a" "b" "c"


julia> a[1:2]
2-element Array{Any,1}:
 RCall.RObject{RCall.CharSxp}
<CHARSXP: "a">

 RCall.RObject{RCall.CharSxp}
<CHARSXP: "b">

Also, when only one element is being extracted from the StrSxp, the element of type CharSxp is returned to the user

julia> a[1]
RCall.RObject{RCall.CharSxp}
<CHARSXP: "a">

To mirror the R behavior, should it be wrapped inside a StrSxp object and then returned to the user? This may be less important.

[simonbyrne]

This seems like a good idea.