Document incorrect about 'default_box_attr' behaviour

In document

default_box_attr will first check if it is callable, and will call the object if it is, otherwise it will see if has the copy attribute and will call that, lastly, will just use the provided item as is

But due to Box init

        self._box_config.update({
            'default_box': default_box,
            'default_box_attr': default_box_attr or self.__class__,

When default_box_attr is logical false (‘’, [], {} etc) it’s actually replaced by Box.

This code won’t work as expected:

x = Box(default_box=True, default_box_attr='')
x.abc  # returns a Box

It has to be

x = Box(default_box=True, default_box_attr=str)
x.abc  # returns ''

So list for [], int for 0 etc

At least version 3.4.6 is working with default_box_attr=''.

Suggestion: Either change document to indicate this detail, or change code to accept '', [], 0 etc. Possible fix is

            'default_box_attr': self.__class__ if default_box_attr is None else default_box_attr,

[cdgriffith]

slated for 4.1 https://github.com/cdgriffith/Box/pull/132

[cdgriffith]

First attempt at fix of this in https://github.com/cdgriffith/Box/commit/1eb54789393063093de4ad1847cabbb51efc2d3b

Pinging @iordanivanov on this thread as well now that there is a possible working update.

More test cases are needed for this to confirm I’m not missing anything.