> Ever found yourself writing this?

  for f in *.txt; do
    wc -l "$f"
  done

No, because `wc` accepts multiple files. And the example given is incorrect for any file having a `.txt` suffix and whitespaces.

> Or this?

  find . -name '*.sh' -exec wc -l {} +

No.

> These all work, but each has its own syntax, its own flags, its own quirks. I wanted something simpler — one consistent way to iterate over anything.

And therein lies the proverbial xkcd standards[0] proof.

0 - https://xkcd.com/927/