Combining Cyrillic numbers

[sofeshue]

There are two special combining signs:
U+0488 COMBINING CYRILLIC HUNDRED THOUSANDS SIGN
U+0489 COMBINING CYRILLIC MILLIONS SIGN

When they are used to circle a letter designating a number, they mean to multiply that number by the said amount. But in Noto Sans, they are somehow treated as individual letters, and when typeset, they juxtapose with the preceding letter, like this (which is completely wrong):

The correct way of rendering them is like this:

Also, Unicode uses U+20DD COMBINING ENCLOSING CIRCLE for Cyrillic ten-thousands sign. The result in Noto Sans is quite unacceptable:

[TidharC]

This is reproducible with current Noto fonts, for example with sequence:

0430 20DD 0430 0488 0430 0489

The code points are:
U+0430 Cyrillic lowercase a
U+20DD ten thousand
U+0488 hundred thousand
U+0489 million

PDF reports are below.

specimenNotoSans-Black.pdf
specimenNotoSansDisplay-Black.pdf
specimenNotoSansDisplay-Italic.pdf
specimenNotoSans-Italic.pdf
specimenNotoSansMono-Regular.pdf
specimenNotoSerif-Black.pdf
specimenNotoSerifDisplay-Black.pdf
specimenNotoSerifDisplay-Italic.pdf
specimenNotoSerif-Italic.pdf

[dscorbett]

These are also wrong.

U+A670 COMBINING CYRILLIC TEN MILLIONS SIGN
U+A671 COMBINING CYRILLIC HUNDRED MILLIONS SIGN
U+A672 COMBINING CYRILLIC THOUSAND MILLIONS SIGN

[nizarsq]

Look like there are some changes to Combining Cyrillic numbers but apparently some adjustment may needed . Language expert opinion on the current status might be helpful.

[simoncozens]

The problem is that the marks are set to category=Mark, subcategory=Enclosing in the sources, which sounds like it's the right thing to do... but it's not! They need to be Nonspacing or else they don't end up as mark glyphs, and don't get attached. The only issue then becomes kerning.