[Pharo-project] What happens with named primitives in CM ?

Hi folks. I was inspecting for example the CM of Integer >> #bitAnd: and the first literal is an array like this: #(#LargeIntegers #primDigitBitAnd 0 17) I understand the first and the second elements, but I don't the third and the fourth. What are they? (0 and 17) because then even seem to change their value. I am asking because I am serializing CompiledMethod and then at materialization time I am putting just two zeros for the moment. But I am not sure what they mean. Thanks in advance, -- Mariano http://marianopeck.wordpress.com