src/main/java/com/googlecode/objectify/impl/Keys.java
@SneakyThrows
	public static com.google.cloud.datastore.Key fromUrlSafe(final String urlSafeKey) {
		if (urlSafeKey.startsWith("a")) {
			return KeyFormat.INSTANCE.parseOldStyleAppEngineKey(urlSafeKey);
		} else {
			return com.google.cloud.datastore.Key.fromUrlSafe(urlSafeKey);
		}
	}
@SneakyThrows
	public static com.google.cloud.datastore.Key fromUrlSafe(final String urlSafeKey) {
		if (urlSafeKey.startsWith("a")) {
			return KeyFormat.INSTANCE.parseOldStyleAppEngineKey(urlSafeKey);
		} else {
			return com.google.cloud.datastore.Key.fromUrlSafe(urlSafeKey);
		}
	}
Understands both the legacy format "ag1zfnZvb2Rvb2R5bmUwcgcLEgFCGAEM" and new format,
providing the key either way.