The project CONTRIBUTING.md says — You will probably come across people saying that the programs are not idiomatic ("enough"). So read the description and writ

The project CONTRIBUTING.md says — You will probably come across people saying that the programs are not idiomatic ("enough"). So read the description and write your own idiomatic program, without programming tricks. That's not the same as "requiring". More like — if you aren't going to contribute idiomatic programs then don't complain when we don't show idiomatic programs.