In a web form, keyPrefix with a `:` does not clear cache properly.

[tswaters]

In the cache provider, when clearing cache, the message is published with

$"{InstanceUniqueId}:{type}:{data}"

And is later parsed out in ProcessMessage:

var values = redisValue.ToString().Split(':');
if (values.Length == 3 && values[0] != InstanceUniqueId) // Avoid to clear twice
{
    instance.Clear(values[1], values[2], false);                        
}

Thing is, InstanceUniqueId includes the config value keyPrefix. If this keyPrefix includes a : the length of the redisValue delimited by : equates to 4, not 3.

We've fixed this locally... and I have a a fix ready for this. Will submit a pull request once I can verify the tests still pass.

[krurkrit]

I think we should concern about {data} with ":" more than keyPrefix.
Because we configure keyPrefix without ":".

But a cache key from DNN, that is sent in {data} part, may contain ':'.