Utilize any extra space the backing allocator gives us for full blocks.
Also fix asan poisoning going past the end of a block PiperOrigin-RevId: 896618655
P
Protobuf Team Bot committed
ef840009ec6058c47b5f6e75e6de109b157543b5
Parent: b22d597
Committed by Copybara-Service <copybara-worker@google.com>
on 4/8/2026, 6:47:09 PM