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3.4 Cacheing and Dispatch Functions

SB-PCL::CACHING functions simply cache effective methods as a function of argument wrappers, while SB-PCL::DISPATCH functions have code that computes the actual dispatch. SB-PCL::CHECKING functions have a cache, but on cache misses will recompute whether or not to generate a SB-PCL::CACHING or SB-PCL::DISPATCH function.

(FIXME: I'm actually not certain about the above paragraph. Read the code again and see if it makes any more sense.)