@which confused by constructors with keyword arguments

[nalimilan]

In the following, it's weird that the custom constructors is called, but that @which is not able to find it. It looks like adding keyword arguments creates a confusion with the fallback constructor.

julia> type A
       end

julia> (::Type{A})(x; y=1) = 1

julia> A(1)
1

julia> A(1; y=2)
1

julia> @which A(1; y=2)
ERROR: no unique matching method for the specified argument types
 in which(::Any, ::Any) at ./reflection.jl:467