Bug when using some symbols as columns names

[piever]

julia> Columns(rand(2), names = [Symbol("false")])
ERROR: TypeError: Type{...} expression: expected UnionAll, got NamedTuples._NT___1__{Bool}
Stacktrace:
 [1] #Columns#15(::Array{Symbol,1}, ::Type{T} where T, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N} where N) at /home/pietro/.julia/v0.6/IndexedTables/src/columns.jl:40
 [2] (::Core.#kw#Type)(::Array{Any,1}, ::Type{IndexedTables.Columns}, ::Array{Float64,1}) at ./<missing>:0

julia> Columns(rand(2), names = [Symbol("f")])
2-element IndexedTables.Columns{NamedTuples._NT_f{Float64},NamedTuples._NT_f{Array{Float64,1}}}:
 (f = 0.439338)
 (f = 0.541298)