Comment by hanez

I chose isolated state (like Lua) rather than a single global lock (like Python’s GIL). Each VM has its own heap, scheduler, and garbage collection. There are no cross-VM pointers. Concurrency and data exchange happen via message passing and a few carefully scoped shared-memory primitives for high‑throughput use cases. This keeps the C API simple, predictable, and safe to embed in multi‑threaded hosts.