O.k., you're talking about extending the one function in situ, not the kind of extension that subclassing or aggregation gives.
And that's essentially my complaint about this technique: it's nearly impossible to build large, extensible frameworks with. In my experience, functional programming works great at small levels of granularity; for anything larger, OO is far more useful. (Of course, the FP purists will disagree, and I'm not saying they're wrong.)
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