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• the TODO is all capitalized
• first letter of TODO message does not need to be upper-case
• there is no colon or dash char after TODO
• there is no period at the end
• description is short (70 chars or less if possible) and helpful
• the TODO message describes an action that needs to be performed in the future

XXX comments

Example of XXX:

  // XXX Hazardous code! We should find a way to make
  //     it more secure

Notice the format:

• the XXX is all capitalized
• there is no colon or dash char after XXX
• there is no period at the end
• description is short (70 chars or less if possible) and helpful
• the XXX is used to warn other programmers of problematic or misguiding code.