send the correct content-length to the playground
send the correct content-length to the playground

The url package uses (length) to determine the content length. For
multibyte sequences, that returns an incorrect result unless we
explicitly hand individual bytes to it.

codemac/go-mode.el,kimiby/go-mode.el,tjyang/go-mode.el,artemave/go-mode.el,magastzheng/go-mode.el,gorakhargosh/go-mode.el,emacsmirror/go-mode,dominikh/go-mode.el,ibukanov/go-mode.el