Function createData

Declares a capability's field contract AND, optionally, the getters/ mutators/subscriptions that acquire, mutate, and continuously observe it -- the batteries-included counterpart to buildData + hand-wired createDataStore/coordinator calls. Internally: exactly one buildData call, exactly one createDataStore instance, and the given (or default) Coordinator -- see the module doc comment.

A schema with no getters/mutators/subscriptions at all still works, returning a fully valid capability with zero bound operation methods -- the direct one-call equivalent of createDataStore(buildData({fields})).