SQL float comparison

gistfile1.txt

MariaDB > SELECT id, summary_rating FROM companies ORDER BY summary_rating DESC;
+-------+----------------+
| id    | summary_rating |
+-------+----------------+
| 75748 |            4.8 |
| 61769 |        4.76842 |
| 12475 |        4.59091 |
| 29849 |           4.54 |
+-------+----------------+

MariaDB > SELECT COUNT(*) FROM `companies` WHERE summary_rating >= 4.59091;
+----------+
| COUNT(*) |
+----------+
|        2 |
+----------+

MariaDB > SELECT COUNT(*) FROM `companies` WHERE summary_rating >= 4.59091 - 1e-6;
+----------+
| COUNT(*) |
+----------+
|        3 |
+----------+