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Implement [OsStr]::join
Implements join for `OsStr` and `OsString` slices:
```Rust
let strings = [OsStr::new("hello"), OsStr::new("dear"), OsStr::new("world")];
assert_eq!("hello dear world", strings.join(OsStr::new(" ")));
````
This saves one from converting to strings and back, or from implementing it manually.
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| Cargo.toml | ||