I agree that that seems surprising and you could file a jira for it.

On Sunday, August 16, 2015 at 10:47:24 AM UTC-5, Ron Toland wrote:
>
> In my local Clojure Users Group last week, we encountered an odd behavior 
> with r/fold.
>
> Specifically, it seems like the three-arity version (r/fold combiner-fn 
> reducer-fn coll) doesn't call the combiner-fn if the coll has fewer 
> elements than the default partition-size (512).
>
> This leads to some surprising behavior. For instance, Example 8 in this 
> (written by someone else, and otherwise very nice) set of reducer examples 
> will not calculate the average-age as desired, since the combiner-fn will 
> not be called for a collection of just 100 elements: 
> https://gist.github.com/ianrumford/6333358
>
> I realize that for a combiner-fn with just zero-arity or two-arity 
> versions defined, calling it on a single partition would not make sense. 
> Perhaps r/fold should be revised so that if a combiner-fn is provided that 
> has a single-arity version defined, it still gets called even if there is 
> just one partition? 
>

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