Module buffer 

Buffer policy values and small expr field-extraction helpers.

This module supplies the stream fabric’s buffering contract: BufferPolicy (a bounded capacity plus an overflow rule), BufferOverflowPolicy (what to do when a full buffer receives a packet), and BackpressureOutcome (the result a producer observes when it offers a packet). Each carries a stable stream/* symbol so the policy round-trips through the runtime’s symbol and Expr surfaces. The crate-private field/string_field/symbol_field helpers read named entries out of an Expr::Map and are reused by sibling modules that decode stream values.

Structs

BufferPolicy

Buffering contract for a stream: a bounded capacity plus an overflow rule.

Enums

BackpressureOutcome

Result a producer observes when it offers a packet to a buffered stream.

BufferOverflowPolicy

Rule applied when a full buffer receives another packet.