Does F# offer this 'type hole' thing? I admit I still like to let a type instance and then fill in its members with calculated values, database reads etc. but

Does F# offer this 'type hole' thing? I admit I still like to let a type instance and then fill in its members with calculated values, database reads etc. but since I'm nice and C#rrupted I don't do it the idiomatic/right way, whatever that way is, I let a mutable type instance then modify and return it to whoever called the function.