I am preparing a circuit using a TP4056. This circuit has a thermal pad. The datasheet says that this pad must be connected to ground or nothing.

However, some forum discussions talk about connecting it to GND or even VIN. Curious, I took apart a commercial module implementing a TP4056 and indeed the pad is connected to VIN. So I'm looking for the best truth. GND, VIN or nothing? Do you have this experience?