i18n.commitencoding=gbk or --encoding=gbk not work with --pretty=format

Hi, all! When set the option i18n.commitencoding value to gbk. I found the 'git log' ouput encoding always is the default : utf8

    git log -n10 --pretty=format:"%h %d %an %s %ci" --topo-order --graph
or
    git log -n10 --encoding=utf8 --pretty=format:"%h %d %an %s %ci"
--topo-order --graph

But:
    git log --oneline

works well. I am from China, and the GFW thing, I can't visit git-scm.com. So, Somebody can help me to report this bug? I am sure it's don't work for Windows (msys-git) or Linux (Chakra). Thanks!

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