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6aa805d581
The` fmt::Debug` implementation of a type should in most cases reveal its internal structure. `StreamProtocol` is likely to be debug-printed a lot and in many cases, the only contract is the `fmt::Debug` impl. The internals of `StreamProtocol` only exist for performance reasons to avoid allocations for statically-known protocol strings. Revealing this implementation detail isn't particularly beneficial to end users. At the same time, the current implementation is very noise.
Previously, the `protocols` field of an `identify::Info` would e.g. read as:
```
protocols: [StreamProtocol { inner: Right("/ipfs/id/1.0.0") }, StreamProtocol { inner: Right("/ipfs/id/push/1.0.0") }, StreamProtocol { inner: Right("/ipfs/kad/1.0.0") }]
```
With this patch, it reads as:
```
protocols: ["/ipfs/id/1.0.0", "/ipfs/kad/1.0.0", "/ipfs/id/push/1.0.0"]
```
Pull-Request: #4631.