I’ve been thinking about this problem since 2004.

Here’s a rough timeline:

- 2004-2018: I had ideas of how to do it but I thought the whole premise (memory safe C) was idiotic.

- 2018-2023: I no longer thought the premise was idiotic but I couldn’t find a way to do it that would result in fanatical compatibility.

- 2023-2024: early Fil-C versions that were much less compatible and much less performant

- end of 2024: InvisiCaps breakthrough that gives current fanatical compatibility and “ok” performance.

It’s a hard problem. Lots of folks have tried to find a way to do it. I’ve tried many approaches before finding the current one.