You're probably right; I don't remember the details. What I do remember was parallelism being dodgy, several team members looking at it until one added an excl

You're probably right; I don't remember the details. What I do remember was parallelism being dodgy, several team members looking at it until one added an exclamation mark and solved the problem. This was F#3 in a legacy project, some five years ago. I bet lot of things have changed since.