Arrays in local.settings.json no longer work for version 4

I recently upgraded to version 4 of the CLI for Mac using the recommended upgrade guide.
After doing so the array functionality for local.settings.json no longer works.
After reverting back the version 3 of the CLI it worked.

local.settings.json example below:
```
{
"IsEncrypted": false,
"Values": {
"ExpirationNeverExpire:[0]": "311",
"ExpirationNeverExpire:[1]": "2007",
"AzureWebJobsStorage": "UseDevelopmentStorage=true",
"FUNCTIONS_WORKER_RUNTIME": "dotnet"
}
}
```

Reading settings code:
```
public static IServiceCollection AddExpirationConfiguration(this IServiceCollection services)
{
services.Configure>(_config.GetSection("ExpirationNeverExpire"));
}

...

public ExpireApplications
(
IOptionsSnapshot> expirationNeverExpire,
)
{
// Version 4, Count = 0
// Version 3, Count = 2
_expirationNeverExpire = expirationNeverExpire.Value ?? new List();
}
```

I tried this using Function v3 and v4. Neither worked with CLI version 4.

Reproduce the issue with the local.settings.json example and compare CLI versions 3 and 4, using the shown AddExpirationConfiguration and IOptionsSnapshot> code to inspect the resulting values. Done means the ExpirationNeverExpire array binds with Count = 2 under CLI version 4 for the reported Function versions.

Written by the indexing model from the issue text.