When will someone actually need `bool foo \iffoo` _without_ `\newif\iffoo`? about tex_expkv HOT 1 CLOSED

\documentclass{article}
\begin{filecontents*}{\jobname.sty}
\ProvidesPackage{\jobname}[2022/10/23 A test package]
\RequirePackage{expkv-def,expkv-opt}
\ekvdefinekeys{foo}{bool foo = \iffoo}
\ekvoProcessLocalOptions{foo}
\end{filecontents*}
\usepackage[foo=false]{\jobname}

\begin{document}
\iffoo
  foo is true.
\else
  foo is false.
\fi
\end{document}