$itemobject|arrayrequired
$column_namestringrequired
This is method that is used to render a column when no other specific method exists for that column. When WP_List_Tables attempts to render your columns (within single_row_columns()), it first checks for a column-specific method. If none exists, it defaults to this method instead. This method accepts two arguments, a single $item array and the $column_name (as a slug).
NOTICE: As of WordPress 3.5.1, in core $item is passed an Object, not an array.
protected function column_default( $item, $column_name ) {}
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https://developer.wordpress.org/reference/classes/wp_list_table/column_default