What does this mean?

I looked into the order data in woocommerce’s order_itemmeta table.

For each order item, there are a few lines for taxes which look like this:

meta_id order_item_id meta_key meta_value
——- ————- ————– ————
9 1 _line_tax_data a:2:{s:5:”total”;a:1:{i:1;s:8:”0.659188″;}s:8:”subtotal”;a:1:{i:1;s:8:”0.659188″;}}

Here is a screenshot of mysql console: https://drive.google.com/file/d/1IFn5cadMkPLvi1es94gfKwzQp9ZYFma-/

Question: how should I interpret the meta_value field? Is there any documentation for this?

Thanks

John Z