Type-safe heterogeneous map in Java

HMap.java

import java.util.IdentityHashMap;

public class HMap {
    public static final class Key<T> {}

    private IdentityHashMap<Key<?>, Object> inner = new IdentityHashMap<>();

    public <T> T get(Key<T> key) {
        Object raw = inner.get(key);
        @SuppressWarnings("unchecked")
        T typed = (T) raw;
        return typed;
    }

    public <T> void put(Key<T> key, T value) {
        inner.put(key, value);
    }
    
    // Example usage:

    private static final HMap.Key<String> NAME = new HMap.Key<>();
    private static final HMap.Key<Integer> AGE = new HMap.Key<>();

    public static void main(String[] args) {
        HMap m = new HMap();
        m.put(NAME, "Turd Ferguson");
        m.put(AGE, 50);

        String name = m.get(NAME);
        Integer age = m.get(AGE);
    }
}

Thanks!