math/big: avoid panic in float.Text with negative prec
Fixes #15918 Change-Id: I4b434aed262960a2e6c659d4c2296fbf662c3a52 Reviewed-on: https://go-review.googlesource.com/23633 Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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