Commits on Jan 31, 2018

1. Make map() and broadcast() faster for Union{T, Missing/Nothing} eltypes …

   Storing typeof(el)/eltype(B) in a variable in the hot part of the loop kills
   performance because despite being inferred as equal to Union{Type{T}, Type{Missing/Nothing}},
   it is marked as ::Any. Only using typeof()/eltype() when isa() fails works around the problem
   and makes map/broadcast(x->x, ::Vector{Union{Int, Missing}}) about 10 times faster.

   

   nalimilan committed Jan 31, 2018
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