Create record instance with default values

F# allows adding methods/properties to records and discriminated unions:

type Person =
{
    Name: string
    Age: int
}
with
    static member Default = { Name = ""; Age = 0 }

In FSI:

 > Person.Default;;
    val it : Person = {Name = "";
                       Age = 0;}

Used unchecked.DefaultOf<'t>. However be aware that F# records are immutable, so this is probably not what you want.