Map does not work with pairs(::NamedTuple)

Internals & Design
1

Is this a bug? I somehow expected it to work. At least the error message could be improved (as no dictionaries are involved at any point). Should I open an issue?

julia> VERSION
v"1.2.0-DEV.219"

julia> nt = (a = 1, b = 2)
(a = 1, b = 2)

julia> map(((n, v),) -> "$n is $v", pairs(nt))
ERROR: map is not defined on dictionaries
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] map(::Function, ::Base.Iterators.Pairs{Symbol,Int64,Tuple{Symbol,Symbol},NamedTuple{(:a, :b),Tuple{Int64,Int64}}}) at ./abstractarray.jl:2049
 [3] top-level scope at REPL[175]:1

# cf collecting before iteration
julia> map(((n, v),) -> "$n is $v", collect(pairs(nt)))
2-element Array{String,1}:
 "a is 1"
 "b is 2"
1 Like
2 
isa(pairs(nt), AbstractDict)

is true. The word in the message, “dictionaries”, is perhaps vague. Does it refer to AbstractDict and subtypes ?