Brent, I think the growTo: addition is good. 

In using replaceFrom: position+1 to: position + n with: aCollection
startingAt: 1, I think you're fixing the wrong thing - you're working
around the real culprit, which is that Text>>replaceFrom:to:with: does
copying, which is quite contrary to other implementations of the same
selector. 

Also, I don't understand the reasoning in removing the test Tim left
there - 
(aCollection isMemberOf: String) not
		ifTrue: [^ super nextPutAll: aCollection].

Daniel

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