I like this kind of syntax because it is a lot like how my ad-hoc print/log statements have been printing structured data all along. For a generic data languag

I like this kind of syntax because it is a lot like how my ad-hoc print/log statements have been printing structured data all along. For a generic data language, SDLang has some oddly specific features: distinction between 32-bit and 64-bit integers, single and double floats, arbitrary strings and base64, 3 single-line comment styles, multiple ways to say booleans. Smells like leaky abstraction, as if the author has ingrained some requirements of the project they've been working on into SDLang rather implementing them in project-specific code. Another commenter has linked KDL language which seems to have cleaner design, and can even satisfy more typing use cases than SDLang.