libs/core: properly handle udata values in overloaded string format operator

diff --git a/libs/core/luasrc/util.lua b/libs/core/luasrc/util.lua
index 9747a44..84c63f2 100644 (file)
--- a/libs/core/luasrc/util.lua
+++ b/libs/core/luasrc/util.lua
@@ -49,8 +49,10 @@ getmetatable("").__mod = function(a, b)
        if not b then
                return a
        elseif type(b) == "table" then
+               for k, _ in pairs(b) do if type(b[k]) == "userdata" then b[k] = tostring(b[k]) end end
                return a:format(unpack(b))
        else
+               if type(b) == "userdata" then b = tostring(b) end
                return a:format(b)
        end
 end