Hi guys in 1.2.1 OrderedCollection new replaceFrom: 1 to: 5 with: #(6 7 8 9 10) startingAt: 1 gave an OrderedCollection(6 7 8 9 10) while in 1.4 and 2.0 OrderedCollection new replaceFrom: 1 to: 5 with: #(6 7 8 9 10) startingAt: 1 raised an error Do you have an idea how I can handle that? Because XMLObservableList and XMLOrderedList implements replaceFrom: to: with: startingAt: because there is no self makeRoomFor: (stop - self capacity) invocation. in 1.4>> replaceFrom: start to: stop with: replacement startingAt: repStart "This destructively replaces elements from start to stop in the receiver starting at index, repStart, in the sequenceable collection, replacementCollection. Answer the receiver. No range checks are performed." | index repOff | repOff := repStart - start. index := start - 1. [(index := index + 1) <= stop] whileTrue: [self at: index put: (replacement at: repOff + index)] at: anInteger put: anObject "Put anObject at element index anInteger. at:put: cannot be used to append, front or back, to an ordered collection; it is used by a knowledgeable client to replace an element." self ensureBoundsFrom: anInteger to: anInteger. ^array at: anInteger + firstIndex - 1 put: anObject in 1.2.1 replaceFrom: start to: stop with: replacement startingAt: repStart "An ordered collection is growable, so a call to this can make the collection grow." self makeRoomFor: (stop - self capacity). array replaceFrom: start + firstIndex - 1 to: stop + firstIndex - 1 with: replacement startingAt: repStart. lastIndex := lastIndex max: stop + firstIndex - 1.