I believe it's a bug.

Francois Maltey <[email protected]>
Newsgroups gmane.comp.mathematics.axiom.general
Message-ID <[email protected]> 
Hello, 

try :

real (%i::Expression Complex Integer)          -- 0, it's right
real (%i::Expression Complex Fraction Integer) -- %i, I'm surprised
real (%i::Expression Fraction Complex Integer) -- %i, I'm surprised

Have a good day.

François
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