The summing function is discussed in the Doing Sums section of perlpacktut (not perlunpacktut, which does not exist) and in unpack, although it must be admitted that examples of counted-field summation in both these sources are a bit rare.

In reply to Re^4: Efficient bit counting with a twist. by AnomalousMonk
in thread Efficient bit counting with a twist. by BrowserUk

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