Less specific full wildcard handler prioritized over more specific

## Issue

If two overlapping full wildcard handlers are registered to a Mux, `GetHandler` will fetch the less specific one.

## Example

```go
m := res.NewMux("")
m.Handle("model.>", h1)
m.Handle(">", h2)
m.GetHandler("model.foo") // returns h2 instead of h1
```