builtin: fix snake_to_camel when passing a SCREAMING_SNAKE_CASE string
#6249
| Job | Run time |
|---|---|
| 1h 47m 30s | |
| 51m 30s | |
| 1h 22m 55s | |
| 2h 17m 38s | |
| 4m 19s | |
| 2h 57m 5s | |
| 9h 20m 57s |