Consider the following two URLs:

    http://bugs.darcs.net/issue?&@columns=id,title&assignedto=twb&@action=search
    http://bugs.darcs.net/issue?&@columns=id,title&assignedto=twb&@action=export_csv

The former works, it only lists tickets assigned to me.  The latter
doesn't, it lists *every* ticket!

This also occurs with status:

    http://bugs.darcs.net/issue?&@columns=status&status=1&@action=search
    http://bugs.darcs.net/issue?&@columns=status&status=1&@action=export_csv

It doesn't affect @search_text for some reason:

    http://bugs.darcs.net/issue?&@columns=status,id,title&@search_text=ISO 8601&@action=search
    http://bugs.darcs.net/issue?&@columns=status,id,title&@search_text=ISO 8601&@action=export_csv

like I need to set @filter to a comma-separated list of all the fields
I'm filtering on...

For example:

curl "http://bugs.darcs.net/issue?$(printf \&%s @columns=status,creator,id,title status=resolved creator=twb @filter=creator,status @action=export_csv)"

I guess this just means my script has to be smarter :-(

PS: I still have to work out how to make the CSV emit words for
enumerated fields likes status instead of unintelligible digits.

For example, instead of

    status,assignedto,creator,id,title
    8,None,391,1058,Wish for bottom-posting on issue pages
    8,None,391,1080,"Link to patch: Fix hang after a user input error (for example, EOF)."

have

    status,assignedto,creator,id,title
    resolved,nobody,twb,1058,Wish for bottom-posting on issue pages
    resolved,nobody,twb,1080,"Link to patch: Fix hang after a user input error (for example, EOF)."