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Euler Rotations have a "rotation order", and in Dreams, that order is yaw (outermost), then pitch, and finally roll (innermost). Imagine a ring rotating about the Y axis, and mounted inside that, another ring rotating about the X axis, and inside that, another ring rotating about the Z axis. Provided that the outermost yaw ring and the innermost roll ring are free to rotate from -180° to +180°, the middle pitch ring only needs the range -90° to +90° in order for the whole rig to be able to achieve any orientation. This is true for any rotation order, not just yaw-pitch-roll - give the outermost and innermost freedom of the full circle and the middle only needs freedom of the semicircle.
If you look at what's happening to an object's yaw and roll when you rotate its pitch past 90° and its pitch starts going down, you'll find that its yaw and roll both flipped by 180º to the opposite point on the circle. Those differences in yaw and roll are how you can tell the difference between two orientations that have the same pitch.