[NTG-context] Placing number in \sqrt

[context at vivaldi.net]

Hello,

compare placing "3" in the following examples:

----
\starttext
   $\sqrt[3]{5}$ % (1)
   \par
   $\sqrt[3~]{5}$ % (2)
\stoptext
----

In the first case, the "3" is placed naturally by ConTeXt and placed 
more in the centre of "V" part of the square sign.

In the second example, the "3" is shifted manually by adding "~" and the 
final placement seems to me a bit better.

What is your opinion - is the case (1) OK/intended and user should avoid 
any manual shifting?

Or manual shifting is OK? Or is there a way to affect this placement 
globally in ConTeXt, e.g. setting an internal variable?

Best regards,

Lukas
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