Implement Decode, Encode and Type for Box, Arc, Cow and Rc
#731
| Job | Run time |
|---|---|
| 1m 39s | |
| 1m 15s | |
| 2m 10s | |
| 2m 45s | |
| 3m 57s | |
| 1m 11s | |
| 1m 45s | |
| 1m 1s | |
| 15m 43s |