'Retrieves the default fill size for this buffer class.
Arguments:
size (int): (Optional) If set and not None, returns the size variable back.
Returns:
Fill size as integer if size == None, else size.'

def get_fill_size(self, size=None):

    if (size is None):
        size = self.buffer_fill_size
    with context.local(buffer_size=size):
        return context.buffer_size
