reallyasi9

"""
  list_all_things(module::Module, [type::Type]) -> Vector{Symbol}

List all the things of a given `type` in `module`. If `type` is not given, all things will be listed.
"""
function list_all_things(m::Module, T::Type)
  return filter(s -> typeof(eval(s)) <: T, names(m))
end

list_all_things(m::Module) = names(m)