IOption<T> should not be CaseSensitive for array

[tebeco]

(From a mobile phone so sorry for possible weird issue)

Repro steps :

• create a simple aspnet core project (I used net462)
• edit appsettings.json to add :
• "direct key" in camelCase like "foo":"bar"
• an array "fooBar": ["foo","bar"]
• create a class with PascalCase properties String Foo{get;set;} String[] FooBar{get;set;}
• add the class to the startup Configure
• inject it in any controller as "config"

The config.Value.Foo will be "bar" While config.Value.FooBar will be nuls

• renaming the json key to : "FooBar": ["foo","bar"]

Will deserialize the array properly

[johnkors]

Couldn't get a failing unit test for this. Maybe it's fixed.

https://github.com/aspnet/Configuration/compare/dev...johnkors:jsonarrays/issue-635