Use decodeUri on path segments

[sethwklein]

For some reason, I expected path segments to be decoded. Once I discovered the resulting bug in my code, I ended up using the following in place of string:

decodedString =
    custom "STRING" <| 
        \encoded ->
            case decodeUri encoded of
                Nothing ->
                    Ok encoded
                
                Just decoded ->
                    Ok decoded

The reason I considered this a bug is that I haven't thought of a case where I wouldn't use the above instead of string.

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.