You're looking for something that's readable but more efficient and smaller than #JSON or #YAML?
Structure data with #ASCII control codes like people did in 1963!

https://trans.github.io/c0data/

There's also a library in @CrystalLanguage available.

#crystallang #crystallanguage

C0DATA — Structure Data with Control Codes

@alexanderadam @CrystalLanguage That looks very curious, I'll give it a try later. Thanks for sharing!