"Tally" is not used often, but it does precisely and concisely describe the 
function. For more reference, those 4 vertical lines with a slash across them 
to represent 5 are known as "tally marks" (see 
https://en.wikipedia.org/wiki/Tally_marks). Also, if this were in our standard 
library, I would always think of Harry Belafonte's _Day-O_ song and smile when 
I use it ("come mister tally man, tally me banana") 
(https://www.youtube.com/watch?v=6Tou8-Cz8is)

-Greg Vaughn

> On Oct 4, 2019, at 7:55 PM, José Valim <[email protected]> 
> wrote:
> 
> So I am not a native speaker, but “tally” sounds very foreign to me. Is it 
> used frequently? I am afraid an uncommon name won’t help with 
> readability/discovery. Is there a reason why it is not called count_by? It 
> seems it was first proposed as such to Ruby. Thank you for the proposal!
> -- 
> 
> 
> José Valim
> www.plataformatec.com.br
> Skype: jv.ptec
> Founder and Director of R&D
> 
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