Getting a lot of this in my logs (trunk):

Use of uninitialized value in numeric comparison (<=>) at /path/to/core/lib/Foswiki/Plugins/TablePlugin/Core.pm line 1421

-- PaulHarvey - 28 Mar 2011

Updated summary - <=> breaks rss feed.

-- GeorgeClark - 29 Mar 2011

We are getting large numbers of these on Foswiki.org as well. It appears that the numeric url params are not validated for numeric. We are getting 80,000+ errors a day. Seems to be caused by the URL parameters sort, sortcol, table and up not being validated as provided, and numeric (or off for sort=.

Argument "" isn't numeric in numeric gt (>) at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 539.
Argument "" isn't numeric in numeric eq (==) at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 620.
Argument "" isn't numeric in array element at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 756.
Argument "" isn't numeric in array element at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 761.
Argument "" isn't numeric in array element at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 762.
Argument "" isn't numeric in array element at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 763.
Argument "" isn't numeric in array element at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 780.
Argument "" isn't numeric in numeric lt (<) at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 1412.
Argument "" isn't numeric in numeric eq (==) at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 1487.
Argument "" isn't numeric in numeric eq (==) at /usr/home/foswiki.org/public_html/lib/Foswiki/Plugins/TablePlugin/Core.pm line 1541.

-- GeorgeClark - 21 Sep 2011