perf: make BufList::remaining() O(1) with a cached byte count#4031

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DioCrafts wants to merge 2 commits intohyperium:masterfrom

DioCrafts:perf/buflist-remaining-o1

Commits on Mar 3, 2026

perf: make BufList::remaining() O(1) by caching total bytes
pozodionisio-droid
committed
fix: add overflow guard in advance() and correct comment in copy_to_bytes()
Dionisio
committed