Buffers elements received from an upstream publisher.
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
- Xcode 11.0+
The maximum number of elements to store.
The strategy for initially populating the buffer.
The action to take when the buffer becomes full.
A publisher that buffers elements received from an upstream publisher.