Where can I find the InSc properties of characters as overridden for
the USE of Windows?

I am trying to work out why on MS Edge I am now getting dotted circles
before U+1A7A TAI THAM SIGN RA HAAM in all of:

ᩆᩢᨠ᩠ᨯᩥ᩺ rank /sak/ <U+1A46, U+1A62, U+1A20, U+1A60, U+1A2F, U+1A65 TAI
THAM VOWEL SIGN I, U+1A7A>,

ᨾᩉᩣᩉᩥᨦ᩠ᨣᩩ᩺ giant fennel /ma haː hiŋ/ <U+1A3E, U+1A49, U+1A63, U+1A49,
U+1A65, U+1A26, U+1A60, U+1A23, U+1A69 TAI THAM VOWEL SIGN U, U+1A7A>

and

ᩆᩣᩈ᩠ᨲᩕ᩺ science /saːt/ <U+1A46, U+1A63, U+1A48, U+1A60, U+1A32,
U+1A55 TAI THAM CONSONANT SIGN MEDIAL RA, U+1A7A>?

U+1A7A used to have InSC=Syllable_Modifier, for which these would all
work (at the cost of ᩈᩮᩥᩁ᩠᩺ᨷ to serve /sɤːp/ <U+1A48, U+1A6E, U+1A65,
U+1A41 TAI THAM LETTER RA, U+1A7A, U+1A60 TAI THAM SIGN SAKOT, U+1A37
TAI THAM LETTER BA> failing), which was then changed to
InSC=Pure_Killer, which will work for all of them once the USE
acknowledges that subjoined consonants may follow vowels (as in
old-fashioned Khmer - see TUS) and that vowels below precede vowels
above in Tai Tham (see Lanna/Tai Tham proposals).

My best hypothesis (not thoroughly tested) is that Windows currently has
InSc=Consonant_Killer, but can I look his up as opposed to
effectively devising a test suite for USE on Office?

Richard.

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