public bool TryGetRaw(string key, out object value) => _metadata.TryGetRaw(key, out value) || PropertyMetadata <T> .For(Object).TryGetRaw(key, out value);
public bool TryGetValue <TValue>(string key, out TValue value) => _metadata.TryGetValue(key, out value) || PropertyMetadata <T> .For(Object).TryGetValue(key, out value);
// IMetadata public bool ContainsKey(string key) => _metadata.ContainsKey(key) || PropertyMetadata <T> .For(Object).ContainsKey(key);