I realize that ESRI is calling their implementation of Fisher-Jenks proprietary. Given the performance with mid-sized datasets, either a significant optimization or a sampling method are being employed. I have found this link that used to point to pseudo code describing the implementation specifics.
Does anyone either 1) have published pseudocode information that they happened to archive for a rainy day, or b) have any information on the implementation details. In the latter case, not need to describe Fisher-Jenks as that algorithm is well documented. I am interested specifically in the ESRI implementation.