New compatibility table at funfedi.dev: JSON-LD @context

https://funfedi.dev/support_tables/generated/context/

6 out of 9 implementations accept any @context value. But Mastodon, Hollo and Friendica reject activity entirely if https://www.w3.org/ns/activitystreams is not included in @context. Mastodon probably does this for no reason, but what about #Friendica and #Hollo?

#ActivityPub specification, section 3. Objects:

Implementers SHOULD include the ActivityPub context in their object definitions. Implementers MAY include additional context as appropriate.

ActivityPub context is recommended, but not required.

@silverpill ActivityStreams allows @context to be missing, too:
When a JSON-LD enabled Activity Streams 2.0 implementation encounters a JSON document identified using the "application/activity+json" MIME media type, and that document does not contain a @context property whose value includes a reference to the normative Activity Streams 2.0 JSON-LD @context definition, the implementation MUST assume that the normative @context definition still applies.
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