Duplicate entry errors when panel_mini name exceeds 32 characters

Related to the issue in https://drupal.org/node/647706.

I ran into a situation where panels_mini had a delta of a mini panel that had a name >32 characters long. panels_mini then created a block with a delta the same as the panels_mini name. Since block->delta has a max size of 32, it created an issue where the mini panel wasn't being deleted when panels_mini_delete ran.

Perhaps panels needs to delete based on the first 32 chars?