The default behavior is to rely on ^self size = 0.
But default size is doing too much (it iterates over all elements).
It's OK for most of our classes which know very well about their size and
override #size.
It's not OK for an eventually lazy or infinite subclass.
I realized this by answering
http://stackoverflow.com/questions/40149826/is-there-a-construct-like-iterate-iterable-if-it-has-elements-else
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