Should it be possible for the user to define their own None/Null/Empty?

[root-11]

In numerical calculations users may want to use 0 or 0.0 instead of None. In strings users may want a different value, f.x. "" as None.
What are the pro/con for implementing a custom None value?

users can/could just update the table instead:

sometable['column_x'] = [x = "" for x in sometable['column_x'] if x is None]  # *strings* 
sometable['column_x'] = [x = 0.0 for x in sometable['column_x'] if x is None]  # *floats*.
sometable['column_x'] = [x = 0 for x in sometable['column_x'] if x is None]  # *integers*.

...?

[root-11]

Overdue. No responses.