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Changes between Initial Version and Version 1 of Ticket #15327, comment 13

initial	v1
1		We were split on whether use pure actions or a whitelist of core action that would be directly called. This patch is something of a compromise. The core actions are added from a list after admin_init. This means the core actions cannot be removed easily using remove_action(). The core actions are added with priority 1. For a plugin to override they would have to explicitly use priority 0. These couple of hoops might at least make plugin authors a bit wary of overriding core ajax actions.
	1	We were split on whether to use pure actions or a whitelist of core action that would be directly called. This patch is something of a compromise. The core actions are added from a list after admin_init. This means the core actions cannot be removed easily using remove_action(). The core actions are added with priority 1. For a plugin to override they would have to explicitly use priority 0. These couple of hoops might at least make plugin authors a bit wary of overriding core ajax actions.
2	2
3	3	This approach could easily be converted from using add_action() to directly calling the core actions.