use UTF-8 as the default encoding for multipart text parts #1484
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After some tests on Chrome, it seems in multipart/form-data bodies, regular field=value parts are encoded using utf-8, not latin1
https://www.w3.org/TR/html5/forms.html#multipart/form-data-encoding-algorithm
https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#dom-xmlhttprequest-send