Why can () be converted to number?

[chrisichris]

Shouldn't the compiler complain when () is casted using 'as' to a number?

java -jar yeti.jar -e "(() as number) + 1"

java.lang.NullPointerException

        at code.apply(<>:1)

        at yeti.lang.compiler.eval._1(eval.yeti:98)

        at yeti.lang.compiler.eval.execClass(eval.yeti:76)

        at yeti.lang.compiler.eval$evaluateYetiCode$._0(eval.yeti:484)

        at yeti.lang.compiler.eval$evaluateYetiCode$.apply(eval.yeti:460)

        at yeti.lang.Fun2_.apply(Unknown Source)

        at yeti.lang.compiler.yeti.main(yeti.yeti:198)