@silverpill Those workarounds for the undermined extensibility don't negate my point and will not generally interoperate. According to the ActivityPub book, "One point to note is that correctly parsing and interacting with AS2 objects with extended properties requires a JSON-LD-aware parser." I agree this isn't absolutely true (in special cases) but try sending expanded "toot" context term URIs and see how well it works 😉 (since all servers AFAIK expect those terms to be compacted).