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We recently added this assertion in #196 Plugging the values into the calculator the quaternion appears to be just outside the epsilon threshold of 10e-6.

0.018510^2 + 0.706860^2 + 0.018510^2 + 0.706860^2 = 0.9999873594

That's a larger error than I would expect for a quaternion based on floating point calculation errors. There's currently not a way to adjust or change this check.

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