There appears to be some runtime overhead from using this package, it's not especially onerous, but it's definitely present:

julia> using WhereTraits, BenchmarkTools

julia> @traits f(x) = x

julia> @btime f(1);
  22.215 ns (0 allocations: 0 bytes)

compare against

julia> g(x) = x;

julia> @btime g(1);
  1.356 ns (0 allocations: 0 bytes)

Doing some inspection, I think this is due to the conflict resolution system which should be resolved at compile time instead of runtime. Is there anything we can do about this?