Bar within math

[context@vivaldi.net]

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Hello,

it seems that bar (even with option 'continue=yes') is not rendered in 
place of '~' within math. See the sample:

----
\definebar[MyBar][color=green,rulethickness=2.8,order=background,offset=1.5,continue=yes]

\starttext
   1 + 2 = \startbar[MyBar]3~kN\stopbar

   $1 + 2 = \startbar[MyBar]3~\text{kN}\stopbar$
\stoptext
----

In the sample 'kN' is a unit, which should be separated by space from 
the result (here: 3);
I am used to put the unit into the math environment and enclose it into 
\text{...}.

Is there a way to make the bar be rendered in places of blanks within 
math, too (like if it was inside $ ... $ - as the first line of the 
sample)?
Or is there a better way to add an unbroken background to a (part of) 
math expression followed by a text (unit)?

Best regards,

Lukas

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\definebar[MyBar][color=green,rulethickness=2.8,order=background,offset=1.5,continue=yes]

\starttext
  1 + 2 = \startbar[MyBar]3~kN\stopbar

  $1 + 2 = \startbar[MyBar]3~\text{kN}\stopbar$
\stoptext

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