General ⇒ Using string values with l3keys

[Salerdam]

I am having trouble using string values when using l3keys. I can only get things to work using a token list followed by expansion. I find no problem using the code for the int case though.

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\documentclass{article}
\ExplSyntaxOn
\str_new:N \cake_lp
\keys_define:nn { cake_keys }
  {
    lp .str_set:N = \cake_lp,
    lp .default:n = {apple},
    lp .initial:n = {apple},
  }
\NewDocumentCommand {\cake} { O{apple} }
  {
    \noindent
    \group_begin:
    \str_case:nn {#1}
      {
        {apple}  { An~apple~cake }
        {carrot}  { A~carrot~cake}
      } 
      \group_end:
  }
\NewDocumentCommand {\goodie} { O{} }
  {
    \keys_set:nn {cake_keys} {#1}
    \cake [\str_use:N \cake_lp]
  }
\ExplSyntaxOff
\begin{document}
\goodie[lp=apple]
\end{document}
 
 
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