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*.comb(/\d+/).sum\$\endgroup\$.summethod was added to the language. Which if I recall correctly would make it unavailable according to the rules. \$\endgroup\$sumof any sort. Partially becausesum(1..5)could be written using the reduce meta operator[+](1..5). At some point it became obvious that there could be an optimization if the input was a range. A range could calculate its sum without going over its contents. So now the meta operator[+]...gets converted tosumwhich will allow for this optimization to take place. Basically the only reasonsumwas added is as an optimization. github.com/rakudo/rakudo/commit/… \$\endgroup\$