custom __type metamethod

Picalines

I want to make a metamethod in order to, for example, the type(Vector2(0,0)) was "Vector2D", not "table". To do this, I rewrote the type function from Lua

local _type = type
function type(v)
    local T = _type(v)
    if T == "table" then
        local tf = getmetatable(v).__type
        if _type(tf) == "function" then
            return tf(v)
        else
            return tostring(tf or T)
        end
    else
        return T
    end
end

But when I run the project, Codea crashes every time (the Problem disappears if i rewrite the type function inside the setup function). Why? How to fix this?

Picalines

Okay, I see what the problem is. I haven't checked whether the table has metatable. Now everything works as it should

rawtype = type
function type(v)
    local T = rawtype(v)
    if T == "table" then
        local mt = getmetatable(v)
        if mt then --fix
            if rawtype(mt.__type) == "function" then
                return mt.__type(v)
            elseif rawtype(mt.__type) == "string" then
                return mt.__type
            end
        end
    end
    return T
end