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math/big: add clarifying (internal) comment
Follow-up on CL 467555. Change-Id: I1815b5def656ae4b86c31385ad0737f0465fa2d6 Reviewed-on: https://go-review.googlesource.com/c/go/+/613535 Auto-Submit: Robert Griesemer <gri@google.com> TryBot-Bypass: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Tim King <taking@google.com>
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@ -643,6 +643,7 @@ func (q nat) divBasic(u, v nat) {
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rec := reciprocalWord(vn1)
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// Invent a leading 0 for u, for the first iteration.
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// Invariant: ujn == u[j+n] in each iteration.
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ujn := Word(0)
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// Compute each digit of quotient.
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