>
> The only validator I see for non-image uploads is IS_UPLOAD_FILENAME, 
> which takes "extension" argument, so only one extension can be provided. 
> How come? I tried (for a test) to use tuple or list as the argument value, 
> but I get such error:
>

filename and/or extension arguments are regular expressions according to 
the validator docstring, so you can use a regex for the extension argument 
specifying a list of possible extension names. Otherwise you could build 
your own validator to read the filename and test for a set of values.

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