fix: reject oversized FFI allocations#2781
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Fixes #2710.
Hi, thanks for maintaining this project.
ArcBuffer::newandcps::Stack::neware public constructors that currently pass user-provided lengths/capacities into raw allocation paths. Extremely large values can lead to allocator aborts, sanitizer failures, or resource exhaustion before the APIs fail in a predictable Rust-side way.This PR adds lightweight bounds checks directly in both constructors. The public API shape is unchanged; oversized inputs now fail with a clear Rust panic instead of reaching a huge raw allocation request.