Bundles Prices different between the price in the front and the price in the index price table

[PierreLeMaguer]

I have a difference of 0.01€ between the price of some bundle products front and index table.

Preconditions

1. Magento 2.1.12

Steps to reproduce

1. Have one simple product at 11.95€ and another at 6.45.
2. Configure a bundle product with these two simple products (use multiselect input type).
3. Set the special price of the bundle product at 90%
4. Index product prices

Expected result

1. The price in the table catalog_product_index_price should be the same than the price showed in the product page.

Actual result

There is a difference of 0.01€ .
Table log (select with the two simple product (9242,9250) and the bundle product (10070))

+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+
| entity_id | customer_group_id | website_id | tax_class_id | price   | final_price | min_price | max_price | tier_price |
+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+
|      9242 |                 0 |          1 |            2 | 11.9500 |     11.9500 |   11.9500 |   11.9500 |       NULL |
|      9242 |                 1 |          1 |            2 | 11.9500 |     11.9500 |   11.9500 |   11.9500 |       NULL |
|      9250 |                 0 |          1 |            2 |  6.4500 |      6.4500 |    6.4500 |    6.4500 |       NULL |
|      9250 |                 1 |          1 |            2 |  6.4500 |      6.4500 |    6.4500 |    6.4500 |       NULL |
|     10070 |                 0 |          1 |            0 |  0.0000 |      0.0000 |   16.5600 |   49.4100 |       NULL |
|     10070 |                 1 |          1 |            0 |  0.0000 |      0.0000 |   16.5600 |   49.4100 |       NULL |
+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+

And the price showed in the product page : 16.57€ and prices of each option : 10€76 and 5€81

It looks like there is a problem of rounding price. I noticed that if I modify the method vendor/magento/module-directory/Model/PriceCurrency.php:: round($price) to round at a precision of 4, I retrieve in the front product page the price of 16.56€ (like in the price index table).
At the opposite, if I modify the method vendor/magento/module-bundle/Model/ResourceModel/Indexer/Price.php::_calculateBundleSelectionPrice($priceType), I edit the round SQL methods to a precision of 2 and I have the price of 16.57€ :

+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+
| entity_id | customer_group_id | website_id | tax_class_id | price   | final_price | min_price | max_price | tier_price |
+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+
|      9242 |                 0 |          1 |            2 | 11.9500 |     11.9500 |   11.9500 |   11.9500 |       NULL |
|      9242 |                 1 |          1 |            2 | 11.9500 |     11.9500 |   11.9500 |   11.9500 |       NULL |
|      9250 |                 0 |          1 |            2 |  6.4500 |      6.4500 |    6.4500 |    6.4500 |       NULL |
|      9250 |                 1 |          1 |            2 |  6.4500 |      6.4500 |    6.4500 |    6.4500 |       NULL |
|     10070 |                 0 |          1 |            0 |  0.0000 |      0.0000 |   16.5700 |   49.4200 |       NULL |
|     10070 |                 1 |          1 |            0 |  0.0000 |      0.0000 |   16.5700 |   49.4200 |       NULL |
+-----------+-------------------+------------+--------------+---------+-------------+-----------+-----------+------------+

Thanks

@PierreLeMaguer, thank you for your report.
We've acknowledged the issue and added to our backlog.