math/big: fix edge case float formatting An edge case exists where index exceeds len(upper.mant) due to decimal trailing-zero trimming; the new invariant permits round-up past upper's mantissa when incrementing the digit will not force a carry. Fixes #80206 Change-Id: I9d346a7a67a7a6c3cfaea50ae6fb67331e853bcb Reviewed-on: https://go-review.googlesource.com/c/go/+/779080 Reviewed-by: Neal Patel <nealpatel@google.com> Reviewed-by: Robert Griesemer <gri@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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