Comment by ingy
3 years ago
> "YAML documents can't start with a tab while JSON documents can, making JSON not a strict subset of YAML"
But YAML can start with tabs. Tabs are allowed as separating whitespace in most of the spec productions but are not allowed as indentation. Even though those tabs look like indentation, the spec productions don't interpret them as such.
See my comment above and esp see https://play.yaml.io/main/parser?input=CXsKCQkibGlzdCI6IFsKC...
Note: the YAML spec maintainers (I am one) have identified many issues with YAML which we are actively working on, but (somewhat surprisingly) we have yet to find a case where valid JSON is invalid YAML 1.2.
Thanks for the clarification. Let's fix it in PyYAML then :)
Speaking of PyYAML, I recently ran into an issue where I had to heavily patch PyYAML to prevent its parse result from being susceptible to entity expansion attacks. It would be nice to at least have a PyYAML mode to completely ignore anchors and aliases (as well as tags) using simple keyword arguments. Protection against entity expansion abuse would be nice too.