refactor: marm some internals as readonly
#2703
| Job | Run time |
|---|---|
| 32s | |
| 35s | |
| 52s | |
| 32s | |
| 37s | |
| 55s | |
| 50s | |
| 36s | |
| 41s | |
| 1m 31s | |
| 55s | |
| 40s | |
| 35s | |
| 1m 21s | |
| 1m 23s | |
| 25s | |
| 1m 34s | |
| 37s | |
| 37s | |
| 1m 1s | |
| 1m 24s | |
| 1m 21s | |
| 1m 1s | |
| 1m 3s | |
| 1m 58s | |
| 55s | |
| 1m 3s | |
| 1m 36s | |
| 46s | |
| 54s | |
| 1m 26s | |
| 28s | |
| 30m 44s |