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│
        └─┘                                                     └─┘