None and NaN Functions

These functions create special values used for missing data and invalid numeric results.

Creates the `none()` value.

Use `none()` when a value is intentionally missing or optional.

Example:

value = none();
 
if(value.is_none())
{
    print('value is missing');
};

Creates a numeric NaN value.

Use `nan()` when a calculation produced an invalid numeric result, but the value should still be treated as a number.

Example:

value = nan();
 
value.is_num();          // true
value.is_num_notnan();   // false

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