[NTG-context] Spacing issue in \digits with mode=3

[Kirill Davidov <davidov_ka@edu.surgu.ru>]

Greetings,

I have been making a table with \digits aligned cells and noticed that
in mode 3 (thin mu skips as group separator, comma as decimal separator)
a specification like {_X.=} causes the single digit number to be
misaligned, it's like there's about 2mu worth of space just before the
number. I don't have much of an idea as to what causes it. It doesn't
seem to be an issue in mode 1, although it may be simply not as
noticeable. This also affects \unit.

MWE:
\setdigitmode{3}

\startdocument

\showglyphs
\enabletrackers[visualizers.glue]
\startxtable[align=center]
    \startxtablehead
        \startxrow
            \startxcell
                Data
            \stopxcell
        \stopxrow
    \stopxtablehead
    \startxtablebody
        \startxrow
            \startxcell
                \digits{10.001==}
            \stopxcell
        \stopxrow
        \startxrow
            \startxcell
                \digits{_1.=====} % weird spacing issue here
            \stopxcell
        \stopxrow
        \startxrow
            \startxcell
                \digits{20.34909}
            \stopxcell
        \stopxrow
    \stopxtablebody
\stopxtable

\halign{%
    \hss\alignmark\hss\cr
    \digits{10.001==}\cr
    \digits{_1.=====}\cr % weird spacing issue here
    \digits{20.34909}\cr
}

\stopdocument

Kirill

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