Even though you copy and paste of address too one has to be careful because you might mistakenly copy an address and left a letter behind mostly at the end of the address. So when copying a wallet address one has to be careful. If it is me, and I copied Wallet address, I would check it twice before leaving it because if you do not checked and you keep it like that and one digit is missing, you do not have to blame the sender. Really I have not seen or heard anyone type wallet address but that not withstanding people might type it if the device the person is using can not copy the address. Devices like small Nokia and Itel. If you are to type the address you better be careful and cross check the numbers, figures, signs, and letters both big letters and small letters. The worst of them all. When you are manually typing the characters and you mistakenly type another character and you send it then the person send the coin and coin entered another person address then your fund is gone.