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Does it make sense to make every function in an ERC20 Token Contract unpayable using 

require(msg.value == 0);

just in case that someone accidentally sends eth to the contract.

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No. A function requires the payable modifier to receive ETH.

There's also a fallback (no name) function that can be made payable or not. But it must be made payable.

Keep in mind inheritance if you're using libraries/frameworks.

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