alt Hacker NewsYes, but that's just the default behavior. You can implement your own non-boxing version for performance critical applications.
Yes, but that's just the default behavior. You can implement your own non-boxing version for performance critical applications.
Why on earth did they decide boxing by default was a sensible design decision...
We have been pushing toward higher performance for years and this is a performance pitfall for unions would are often thought of as being lighter weight than inheritance hierarchies.
F# just stores a field-per-case, with the optimization that cases with the same type are unified which is still type safe.