How to check if value is null, today?

[tastyminerals]

The new `DMD v2.097.2` deprecated implicit null conversions 
`std.typecons.Nullable!double.Nullable.get_`.

The deprecation warning tell you to `Please use .get explicitly.`.

Here is an example code that doesn't work with the new compiler 
anymore:

```
if (someValue.isNull)
```

Attempting to run the above throws:
```
Error: incompatible types for `(0) : (someValue)`: `int` and 
`Nullable!int`
```

I am not sure I understand what kind of `.get` overload are we 
supposed to use here. I tried to read the documentation but looks 
like it is yet to be updated.

Can somebody please help me out?