fix compile time evaluation when StringNode has a Unicode string as value
fix compile time evaluation when StringNode has a Unicode string as value

mrGeen/cython,hickford/cython,JelleZijlstra/cython,mcanthony/cython,da-woods/cython,c-blake/cython,hickford/cython,fabianrost84/cython,da-woods/cython,fperez/cython,acrispin/cython,hhsprings/cython,mcanthony/cython,mrGeen/cython,hickford/cython,cython/cython,hickford/cython,cython/cython,ChristopherHogan/cython,da-woods/cython,scoder/cython,ChristopherHogan/cython,JelleZijlstra/cython,hhsprings/cython,hhsprings/cython,mrGeen/cython,da-woods/cython,fperez/cython,fperez/cython,fabianrost84/cython,fabianrost84/cython,hhsprings/cython,scoder/cython,ChristopherHogan/cython,c-blake/cython,cython/cython,c-blake/cython,cython/cython,acrispin/cython,mrGeen/cython,hickford/cython,scoder/cython,fabianrost84/cython,acrispin/cython,mcanthony/cython,mcanthony/cython,acrispin/cython,hhsprings/cython,mcanthony/cython,scoder/cython,fperez/cython,fperez/cython,fabianrost84/cython,JelleZijlstra/cython,mrGeen/cython,JelleZijlstra/cython,JelleZijlstra/cython,c-blake/cython,c-blake/cython,acrispin/cython