Hi Iâm spotting real inconsistency in the specification and use of newFrom: In Pharo and Object we have newFrom: aSimilarObject "Create an object that has similar contents to aSimilarObject. If the classes have any instance variables with the same names, copy them across. If this is bad for a class, override this method." ^ (self isVariable ifTrue: [self basicNew: aSimilarObject basicSize] ifFalse: [self basicNew]) copySameFrom: aSimilarObject The ANSI standard does not define newFrom: Now in Pharo some classes such dictionary expect as argument a dictionary but OrderedDictionary expects a like of association! Set expects a collection, Bag too and many others. CompiledMethod expects a compiledMethod I think that it would be good to strengthen this method and we could define newFromSibling: but it looks like a copy to me. S -------------------------------------------- Stéphane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, Bât.A, Park Plaza Villeneuve d'Ascq 59650 France