Ouch. That tab error is a bug in libyaml, the YAML loader used by PyYAML. It's still stuck on YAML 1.1, but the spec explicitly allows tabs as whitespace, thoug

Ouch. That tab error is a bug in libyaml, the YAML loader used by PyYAML. It's still stuck on YAML 1.1, but the spec explicitly allows tabs as whitespace, though they don't count as indentation semantics.[0] The same is true in YAML 1.2, so it's not just a legacy thing, either. [0]:https://yaml.org/spec/1.1/#id893482 https://yaml.org/spec/1.1/#id893482