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Confirmed in trunk. Here's a copy-n-past'able testcase:
class xcomplex( complex ):
 def __new__(cls,*args,**kwargs):
 return complex.__new__(cls,*args,**kwargs)
 def __coerce__(self,other):
 t = complex.__coerce__(self,other)
 try:
 return (self,xcomplex(t[1]))
 except TypeError:
 return t
 def __add__(self,x):
 return xcomplex( complex.__add__(self,x) )
 def __radd__(self,x):
 return xcomplex( complex.__radd__(self,x) ) 
class xfloat(float):
 def __new__(cls,*args,**kwargs):
 return float.__new__(cls,*args,**kwargs)
 def __coerce__(self,other):
 t = float.__coerce__(self,other)
 try:
 return (self,float(t[1]))
 except TypeError:
 return t
 def __add__(self,x):
 return xfloat( float.__add__(self,x) )
 def __radd__(self,x):
 return xfloat( float.__radd__(self,x) )
z = 1j
xz = xcomplex(1j)
f = 1.0
xf = xfloat(1.0)
print type(z + xz)
print type(f + xf)