FIXED: false gets evaluated for skinparam        
             (i.e. shadowing false does not work)             
                                                              
     ┌─┐                                                   ┌─┐
     │a│                                                   │b│
     └┬┘                                                   └┬┘
      │<color:red>false</color> is evaluated (ok)           │ 
      │{{                                                   │ 
      │c->d: <color:red>false</color> is inherited too (ok) │ 
      │}}                                                   │ 
      │                                                     │ 
      │────────────────────────────────────────────────────>│ 
     ┌┴┐                                                   ┌┴┐
     │a│                                                   │b│
     └─┘                                                   └─┘