from preamble:

"Change Set:		OCAtIfAbsentPut
Date:			14 November 2003
Author:			Marcus Denker

This changeset adds at:ifAbsentPut: to OrderedCollection

The comment:

Return value at index, however, if value does not exist (nil or out of
bounds) then add block's value at index (growing self if necessary)

This is used by the ClosureCompiler (IRBuilder)
"!
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