broadcast over tuple

[Keno]

Should this work:

julia> sin.((1,2))
ERROR: MethodError: no method matching getindex(::Tuple{Int64,Int64}, ::CartesianIndex{2})
 in collect(::Base.Generator{UnitRange{Int64},Base.Broadcast.##1#2{Tuple{Tuple{Int64,Int64}}}}) at ./array.jl:268
 in broadcast_t(::Function, ::Type{Any}, ::Tuple{Int64,Int64}, ::Vararg{Tuple{Int64,Int64},N}) at ./broadcast.jl:222
 in broadcast(::Function, ::Tuple{Int64,Int64}) at ./broadcast.jl:230
 in eval(::Module, ::Any) at ./boot.jl:234
 in macro expansion at ./REPL.jl:92 [inlined]
 in (::Base.REPL.##3#4{Base.REPL.REPLBackend})() at ./event.jl:46

[yuyichao]

Dup of #17411