Deprecation Guide for Deprecate Promise Many Array Behaviors

Deprecates store.hasRecordForId(type, id) in favor of store.peekRecord({ type, id }) !== null.

Broadly speaking, while the ability to query for presence is important, a key distinction exists between these methods that make relying on hasRecordForId unsafe, as it may report true for a record which is not-yet loaded and un-peekable. peekRecord offers a safe mechanism by which to check for whether a record is present in a usable manner.