DiazCarrete, 
TIL that operations on IORefs (unlike some operations on MVars) are are guaranteed not to be interruptible.
https://hackage.haskell.org/package/base-4.19.1.0/docs/Control-Exception.html#g:13
DiazCarrete, TIL that operations on IORefs (unlike some operations on MVars) are are guaranteed not to be interruptible.
https://hackage.haskell.org/package/base-4.19.1.0/docs/Control-Exception.html#g:13