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I have a question about the following Lua-CGI example:

For Example URL:

you will get filled tables like: 
    CGI.path_info         = "/extra/path"
    CGI.form_data["word"] = "hello"
    CGI.form_data[1]      = "numbered"

I can easyly ask, if e.g.


is empty or set to something. I think I could also ask for 

CGI.form_data.word = "hello"

am I right? But how can I, if I gave a numbered in the URL like above, 
find out, if numbered is in the table CGI.form_data? Do I have to step 
through all the table? 

So you see, I'm new to lua, and possibly it's totally easy...   :-(