Why won't custom indexes work when the value comes from \getvalue?

Why won't custom indexes work when the value comes from \getvalue?

[Joel via ntg-context]

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I setup a custom index like this (see minimum example code below):
The problem is, when I try to create an index entry, using \setcoreidea, but place \getvalue inside, it won't render, ex.: \setcoreidea{\getvalue{secret1}}
As you can see in this sample code, \setcoreidea will work fine, but when \getvalue{} is placed inside, it can't find the value.

Any suggestions?
--Joel


\defineregister[coreidea][compress=yes]\setupregister[coreidea][style=sansbold, textstyle=slanted, n=2, pagenumber=yes, indicator=no]

\define[1]\setcoreidea{%
    \coreidea{#1}%
}

\setvalue{secret1}{this won't work}

\starttext

%

\setcoreidea{this works}

\input knuth
\input knuth
\input knuth
\input knuth


\setcoreidea{\getvalue{secret1}}

        \startchapter[title=Core Ideas]
            \placecoreidea
        \stopchapter
\stoptext



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