Signed versus Unsigned Integers

Am I correct to say the difference between a signed and unsigned integer is:

  1. Unsigned can hold a larger positive value and no negative value.
  2. Unsigned uses the leading bit as a part of the value, while the signed version uses the left-most-bit to identify if the number is positive or negative.
  3. Signed integers can hold both positive and negative numbers.

Any other differences?

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