What's up with `broadcasting over dictionaries and NamedTuple's is reserved`

[mauro3]

Is there a consensus on what to do about broadcasting named tuples and dicts? Currently (Julia 1.1):

julia> sin.((a=1,))
ERROR: ArgumentError: broadcasting over dictionaries and `NamedTuple`s is reserved

I'm asking because I'm pondering to make structs defined with @with_kw of Parameters.jl automatically not broadcast mauro3/Parameters.jl#70. However, it would also be nice, if named tuples and dicts would work as drop-in for @with_kw structs. Thus, will they broadcast as scalars or as containers?

x-ref: #26212; add milestone?

[mbauman]

Hasn't been much development along these lines lately, but I know I'd be excited to see a behavior like #24019 which would broadcast functions over values and match keys.

I'd not be excited about them broadcasting as scalars.

Edit: see also #25904 and #5794.

[mauro3]

Sounds good. Thanks for the quick reply!