ctools.module string comparison error causes removal of ALL regions (should only be sidebars)

Finally worked my way to the bottom of this issue after pulling my hair out with Panels for a day. CTools provides a function to strip all sidebar regions (which Panels calls using the Disable drupal blocks/regions setting).

Line 775 of ctools.module reads:
if (substr_compare($block->region, 'sidebar', 0)) {
unset($blocks($block_id));
}

This evaluates to true for all cases EXCEPT where the two strings are IDENTICAL. (substr_compare calls strcmp which is <0 for nonmatch, 0 for full match and >0 for partial match). 0 converts to FALSE, but -1 and +1 both convert to TRUE.

I have corrected the error by adding the explicit comparitor >=0 to read:
if (substr_compare($block->region, 'sidebar', 0)>=0) {
unset($blocks($block_id));
}

This now works as intended.
(This is my first debugging experience with PHP and I have no idea how to make a patch, and at 1am I have little desire to learn right now...) ;)