[Discuss] Is it common sense to set vec![0u8; 8] as the default value of Hex?

[yangby-cryptape]

What happened

Is it common sense to set vec![0u8; 8] as the default value of Hex?

axon/protocol/src/types/primitive.rs

Lines 111 to 115 in 2877191

	impl Default for Hex {
	fn default() -> Self {
	Hex(vec![0u8; 8].into())
	}
	}

In other words, let's pick 5 non-Axon developers randomly and ask them what is the default value of a hex string they think.
I don't think 8 zero bytes was the answer of most people.

An uncommon sense default value is very dangerous.
When we use an open-source type, have we checked their default values carefully before use?
Image that, we import an open-source U256, that it has set 1 as default value, what will happen.