[NTG-context] usage of conversion in \date

["Peter Münster" <pm@a16n.net>]

Hi,

When printing a date in French, I would like to convert the "1" to
"1\ier", but it does not work as I expect:

--8<---------------cut here---------------start------------->8---
\startluacode
-- from https://wiki.contextgarden.net/Command/defineconversion:
interfaces.implement {
    name      = "FRdate",
    public    = true,
    arguments = "string",
    actions   =
        function(s)
            local n = tonumber(s)
            if n == 1 then
                context"1\\ier"
            else
                context(s)
            end
        end
}
\stopluacode
\def\ier{\highordinalstr{er}}
\mainlanguage[fr]
\defineconversion[frd][\FRdate]
\setuplanguage[fr][date={day:frd,\ ,month,\ ,year}]
\starttext
Conversion: \convertnumber{frd}{1}, \convertnumber{frd}{2} (OK)\\
Dates: \date[d=1], \date[d=2] (not OK)
\stoptext
--8<---------------cut here---------------end--------------->8---

How could I get "1\ier\ novembre 2023" please?

TIA for any help,
-- 
           Peter
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