When loading babel with spanish, spurious document command parser

Question

The code below was run with different combos involving spanish or english, and the resulting command \Foo, interprets the input in a manner that seems spurious when spanish is loaded. What am I missing?

\documentclass{article}
\usepackage{xparse}
\usepackage[
english,
spanish,
%english
]{babel}

\ExplSyntaxOn
  \DeclareDocumentCommand \Foo
  {
    D<>{Hello}                  % #1
    m                           % #2
  }
  {
    #1, #2!
  }

\tl_new:N \LoadedLanguages
\makeatletter
\@ifpackagewith{babel}{english}
{
  \@ifpackagewith{babel}{spanish}
  {\tl_set:Nn\LoadedLanguages{english~\&~spanish}}
  {\tl_set:Nn\LoadedLanguages{english}}
}
{
  \@ifpackagewith{babel}{spanish}
  {\tl_set:Nn\LoadedLanguages{spanish}}
  {}
}

\makeatother

\ExplSyntaxOff
\begin{document}

Loaded: \LoadedLanguages;~selected:~\languagename.

\Foo<Jello>{ world } (Expected: Jello, World!)

\end{document}

Answer 1

spanish activates < and > to enter guillemets, or more exactly as a shorthand for the quoting environment. This ‘misfeature’ made some sense about 25 years ago. You can deactivate it with:

\usepackage[
english,
spanish.noquoting
]{babel}