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While using this library, I end up having lifetime issues with
`Config::get`. I've seen that current implementation forces the calleer
to match `key` lifetime to the output of the function.
My use case is, under some circumstances, return a suffixed version of
the config key. Something similar to:
```
if some_condition == true {
let key_name = format!("{}_suffix", key);
self.config.get(&key_name)
} else {
self.config.get(key)
}
```
This code is noy compiling for me due to conflicting lifetimes. To avoid
this, I've started looking to the code and I've found that `key` needed
this lifetime because of `ValueWithKey`. The purpouse of this struct
seems to be add more information to the errors that are returned to the
user.
To mitigate this lifetime coupling I've:
- Mapped the error on `Config::get` to include the originating key of
the current error
- Remove all the code related with `ValueWithKey`
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