Broadcast had one job (e.g. broadcasting over iterators and generator) #18618
Closed
Description
It was surprising to find that broadcast is not working with iterators
dict = Dict(:a => 1, :b =>2)
@show string.(keys(dict)) # => Expected ["a", "b"]
"Symbol[:a,:b]"
This is due to Broadcast.containertype returning Any
Line 31 in 413ed79
leading to the fallback at:
Line 265 in 413ed79
Defining containertype to be Array for that iterator lead to problems with calling size on it, because broadcast doesn't check against the iterator interface iteratorsize(IterType).
map solves this with the fallback map(f, A) = collect(Generator(f,A)) which may be more sensible that the current definition of broadcast(f, Any, A) = f(A)
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