New Canonical Decompositions to Non-Starters

Is there any guarantee that U+E4567 will not have a
canonical decomposition mapping to <U+0F73 TIBETAN VOWEL SIGN II,
U+E4568>? If so, where is it published? I thought we had guarantees
that new canonical decompositions to non-starters would not be created
(to <U+0F71, U+0F72, U+E4568> in this case), but I cannot find it. This
conceivable decomposition mapping appears to wriggle through a
loophole because U+0F73 is a starter, i.e. has canonical combining
class 0.

Richard.
Received on Sun Feb 17 2013 - 10:25:09 CST