Verify the Actor run input is typed the way we want

[vdusek]

#1040 typed the Actor run input as ActorInput, an alias for object. Before 3.0 ships, confirm that alias is what we want and settle the two loose ends it left.

• contentType is still supported. The option stayed, and its docs now describe form-encoding an object. If non-JSON Actor input is being sunset, the option should go with it.
• object is wider than "an object or an array". A Date compiles and posts a JSON string, a Map or a Set posts {}, and a bare function throws inside axios before any request is sent.

✍️ Drafted by Claude Code

[B4nan]

ActorInput

If we want to accept POJO or an array of POJOs, better to declare it as something like:

type Dictionary = Record<PropertyKey, unknown>;
type ActorInput = Dictionary | Dictionary[];