Adding levels to ordered categorical array

[bkamins]

I find the following behavior inconsistent. Is it on purpose?

julia> using CategoricalArrays

julia> x = categorical([1,2,3], ordered=true)
3-element CategoricalArrays.CategoricalArray{Int64,1,UInt32}:
 1
 2
 3

julia> x[3] = 10
ERROR: cannot add new level 10 since ordered pools cannot be extended implicitly. Use the levels! function to set new levels, or the ordered! function to mark the pool as unordered.

julia> recode(x, 3=>10)
3-element CategoricalArrays.CategoricalArray{Int64,1,UInt32}:
 1
 2
 10

[nalimilan]

That's an oversight, the optimized recode method needs an additional check.