[cells-devel] Synapses and Cells Unified

[Kenny Tilton]

Whoa, that was easy. Synapses are now just like any other rule-based 
cell. This was achieved by giving all such cells some new 
expressiveness: the rule for a cell is now understood to return two 
values. the second can be :propagate, :no-propagate, or nil, with these 
semantics:

- nil  Use EQL or slot unchanged test if specified to test
         if new and old values are different. (Old behavior.)

- :propagate  Tell all users to recalculate regardless of the new value.

- :no-propagate  Do not propagate, regardless of the new value.

Not exactly sure how normal ruled cells will benefit from the new 
capability, but I suspect they will. (I also expect the nature of this 
new capability to get a lot of refinement as it gets put to use, so 
forward requests/complaints freely.)


kt

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