Comment by simonw

It looks like there are two maintained implementations of this at the moment - one in C# https://github.com/j-brooke/FracturedJson/wiki/.NET-Library and another in TypeScript/JavaScript https://github.com/j-brooke/FracturedJsonJs. They each have their own test suite.

There's an older pure Python version but it's no longer maintained - the author of that recently replaced it with a Python library wrapping the C# code.

This looks to me like the perfect opportunity for a language-independent conformance suite - a set of tests defined as data files that can be shared across multiple implementations.

This would not only guarantee that the existing C# and TypeScript implementations behaved exactly the same way, but would also make it much easier to build and then maintain more implementations across other languages.

Interestingly the now-deprecated Python library does actually use a data-driven test suite in the kind of shape I'm describing: https://github.com/masaccio/compact-json/tree/main/tests/dat...

That new Python library is https://pypi.org/project/fractured-json/ but it's a wrapper around the C# library and says "You must install a valid .NET runtime" - that makes it mostly a non-starter as a dependency for other Python projects because it breaks the ability to "pip install" them without a significant extra step.