Last updated at 9:41 am UTC on 2 July 2018
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The default action is just to keep the object read as is:
"Normally this read-in object is exactly what we want to store. 7/26/96 tk"
ImageSegment overrides this method and has a long elaborate algorithm.
See ImageSegment comeFullyUpOnReload: smartRefStream
DiskProxy also has an elaborate implementation, a different one.