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由 Eugene Brevdo 提交于
Improves numerical precision (if applicable) using pairwise summation: https://en.wikipedia.org/wiki/Pairwise_summation Thanks to Rasmus Larsen for the succinct binary tree aggregation pseudocode. Also adds AsString for Variant types: this emits the Variant as a string via its DebugString(). PiperOrigin-RevId: 340246073 Change-Id: I009281f46cbea30d6e33ecf79a1723d62e96cc6d
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