问题已修复(一年前，但分享以防对其他人有帮助).

Problem fixed (a year ago, but sharing in case it helps anyone else).

我写信给包的创建者 Jeroen Ooms，他建议我从 GitHub 下载包，因为问题已在那里解决.这是一年多前的事情了，所以我想现在从 CRAN 下载时，标准包也不会有这个问题.

I wrote to the creator of the package, Jeroen Ooms, who advised me to download the package from GitHub since the problem was fixed there. This was more than a year ago, so I imagine by now the standard package doesn't have this problem also when downloading from CRAN.

从 GitHub 下载:

To download from GitHub:

devtools::install_github("jeroen/jsonlite")