prime, Prime, tprime, & qprime as postfix operators

Dear Friends,

Browsing through the testsuite, I find Firefox 1.5 almost perfect!
In some cases it's showing up errors in the sample images, e.g.,
Presentation/TokenElements/mi/mimathvariant14.png (displayed in
mimathvariant.xml).

I'm finding inconsistency in the current rendering of the following
presentation language:

<math xmlns="&mathml;">
  <mi>x</mi><mo>′</mo>
  <mo>+</mo>
  <mi>x</mi><mo>″</mo>
  <mo>+</mo>
  <mi>x</mi><mo>‴</mo>
</math>

″ and ‴ as postfix operators are by default raised, while
′ is not.  My recollection is that ′ was also raised in
the early days of Mozilla MathML.  In fact, see the 6th term in
the testsuite image:
http://www.w3.org/Math/testsuite/testsuite/Topics/Primes/primes1.xml

Is the inconsistency intentional?

                                    -- Bill

P.S.  I wonder if it might not also be reasonable to provide raising
in the cases of <mi>x'</mi> or <mi>x′</mi>.

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