Single & (and single | for "or") are bitwise and/or, not logical and/or. They have to evaluate both sides to be able to return a result. For example: 1100

Single & (and single | for "or") are bitwise and/or, not logical and/or. They have to evaluate both sides to be able to return a result. For example: 1100 & 0101 -> 0100 1100 | 0101 -> 1101