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Thank you for the answer of previous question.
Another one:
If I have a Lua table which is
color["red" = 1 "green" =5 "blue" =6].
I wonder how to get the field names and put them
in a set. I want to get ["red" "green" "blue"].
I will write a Lua function to get them.
But is there any way to do that ?

Thank you