fix(init): enable ignore_invalid for msgpack

Needed to prevent errors when packing glm polygons and such.

init.lua

@@ -17,6 +17,9 @@ local status = export.hasLoaded()
 
 if status ~= true then error(status, 2) end
 
+-- Ignore invalid types during msgpack.pack (e.g. userdata)
+msgpack.setoption('ignore_invalid', true)
+
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