Losslessly converts a 64-bit signed integer in 32:32 split representation into a decimal string.
Copyright 2008 Google Inc. All rights reserved.
See https://github.com/protocolbuffers/protobuf-javascript/blob/a428c58273abad07c66071d9753bc4d1289de426/experimental/runtime/int64.js#L10
Losslessly converts a 64-bit signed integer in 32:32 split representation into a decimal string.
Copyright 2008 Google Inc. All rights reserved.
See https://github.com/protocolbuffers/protobuf-javascript/blob/a428c58273abad07c66071d9753bc4d1289de426/experimental/runtime/int64.js#L10