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The low-level `Curve25519.fromEdwards25519()` function assumed that the X/Y coordinates were not scaled (Z=1). But this is not guaranteed to be the case. In most real-world applications, the coordinates are freshly decoded, either directly or via the `X25519.fromEd25519()` function, so this is not an issue. However, since we offer the ability to do that conversion after arbitrary computations, the assertion was not correct.