JLD , How to remove object from "file.jld"?

How to remove object"A" from “file.jld” ?

julia> file=jldopen(“file.jld”,“r+”)
Julia data file version 0.1.1: file.jld
julia> names(file)
0-element Array{String,1}
julia> write(file,“A”,A)
julia> write(file,“B”,B)
julia> names(file)
2-element Array{String,1}:
“A”
“B”

How to remove object"A" from “file.jld” ?

Paul

delete!(file,“A”)