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The original chunk file format* was created for Smalltalk-80. Since this was published a number of Smalltalk implementations have deviated from it, principally with differing support for class and method categorization. Dolphin also joins this merry band through virtue of supporting multiple class and methods categories whereas the Smalltalk-80 standard format is restricted to one.
*Glenn Krasner, "The Smalltalk-80 Code File Format" in Smalltalk-80: Bits of history, words of advice, Addison-Wesley, 1983.