Why Rust or Zig and not C?
Also some nebulous "being more secure". Never mind that this tool does not have elevated privileges. You gotta watch out for those remote root exploits even for a local only app, man.
But I suppose it's not a very likely bug to have in this kind of tool.
Memory safety is cool and all, but a program that effectively sums a bunch of numbers together isn't going to cause issues. Worst case the program segfaults