\setregisterentry levels with colon (keys:1, entries:1) in lua

[Jano Kula <jano.kula@gmail.com>]

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Greetings!

One can can set register levels with keys and entries
\setregisterentry[MyIndex]
    [keys:1=Sorting Key Level 1,
     entries:1=Entry Level 1,
     keys:2=Sorting Key Level 2,
     entries:2=Entry Level 2]

Rewriting the code in lua works until colon (:) is used.
\startluacode
context.setregisterentry({ "MyIndex" },
   { keys:1="C Level 1", entries:1="C Level 2"})
\stopluacode
which stops with error: <name> expected near '1'

Can the colon be escaped or underlying
   \xdef\currentregisterkeysa{\registerparameter{\c!keys:1}}%
   \xdef\currentregisterkeysb{\registerparameter{\c!keys:2}}%
   \xdef\currentregisterkeysc{\registerparameter{\c!keys:3}}%
redefined? Tried without success.

MWE (mkiv, latest beta) attached.

Thank you,
Jano

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\defineregister[MyIndex]

\starttext

% ConTeXt way
A\expanded{\setregisterentry[MyIndex]
    [keys:1=A Level 1,
     entries:1=A Level 1,
     keys:2=A Level 2,
     entries:2=A Level 2]}

% Lua way
\startluacode
-- command without colon OK
context("B")
context.setregisterentry({ "MyIndex" },
    { keys="B", entries="B"})
-- command with colon NOK
-- context("C")
-- context.setregisterentry({ "MyIndex" },
--    { keys:1="C Level 1", entries:1="C Level 2"})
\stopluacode

\placeregister[MyIndex][criterium=all]

\stoptext

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