Expand description
Reusable byte-buffer pool.
Ports polyfill-rs’s buffer_pool.rs to px-core. Used by the WS hot path and
HTTP body reads to avoid realloc churn. Each buffer defaults to 512 KB;
pool size 10. Buffers that have grown past 2x the configured size on return
are shrunk back so the pool does not retain pathologically large allocations.