allow more types for _broadcast + fix round

src/broadcast.jl

@@ -8,6 +8,10 @@
     _broadcast(f, broadcast_sizes(a...), a...)
 end
 
+@propagate_inbounds function broadcast{T}(f::Function, a::Type{T}, x::StaticArray)
+    _broadcast(f, (Size(), Size(x)), T, x)
+end
+
 @inline broadcast_sizes(a...) = _broadcast_sizes((), a...)
 @inline _broadcast_sizes(t::Tuple) = t
 @inline _broadcast_sizes(t::Tuple, a::StaticArray, as...) = _broadcast_sizes((t..., Size(a)), as...)
@@ -23,7 +27,7 @@ function broadcasted_index(oldsize, newindex)
     return sub2ind(oldsize, index...)
 end
 
-@generated function _broadcast(f, s::Tuple{Vararg{Size}}, a::Union{Number, StaticArray}...)
+@generated function _broadcast(f, s::Tuple{Vararg{Size}}, a...)
     first_staticarray = 0
     for i = 1:length(a)
         if a[i] <: StaticArray
@@ -57,7 +61,7 @@ end
     current_ind = ones(Int, length(newsize))
 
     while more
-        exprs_vals = [(a[i] <: Number ? :(a[$i]) : :(a[$i][$(broadcasted_index(sizes[i], current_ind))])) for i = 1:length(sizes)]
+        exprs_vals = [(!(a[i] <: AbstractArray) ? :(a[$i]) : :(a[$i][$(broadcasted_index(sizes[i], current_ind))])) for i = 1:length(sizes)]
         exprs[current_ind...] = :(f($(exprs_vals...)))
 
         # increment current_ind (maybe use CartesianRange?)
@@ -77,7 +81,7 @@ end
         end
     end
 
-    eltype_exprs = [:(eltype($t)) for t ∈ a]
+    eltype_exprs = [t <: AbstractArray ? :($(eltype(t))) : :($t) for t ∈ a]
     newtype_expr = :(Core.Inference.return_type(f, Tuple{$(eltype_exprs...)}))
 
     return quote