Feature summary (what you would like to be able to do and where):

An option should be added to the Parsoid API that re-enables sequential, in-order processing of extension tags, and disables partial caching.

Benefits (why should this be implemented?):

With the coming of Parsoid, sequential, in-order processing of extension tags will no longer be guaranteed. This makes it (nearly) impossible for extension to maintain global state, as is required for e.g. Variables, Arrays and HashTables. While I am a proponent of a more functional parsing approach, a large part of the community is concerned about the coming of Parsoid because these extensions will no longer work (especially the Variables extension, which is used on over 1,500 wikis).