Dictionary ModelBinding with an empty prefix has unvalidated keys

[rynowak]

Trying to model bind the following:

"?[0].Key=key0&[0].Value=10"

public void DoThing(IDictionary<string, int> p)
{
}

Will result in ModelState.IsValid == false. The keys [0].Key and [0].Value are marked as unvalidated.

If you use a prefix in the query string, this issue doesn't occur. "?p.[0].Key=key0&p.[0].Value=10"

[rynowak]

Very likely fixed as part of 22f1881 - this no longer repros.

Enabled tests in 6e1226b