Attempting to call component.br_reactor.getControlRodLevel(1) returns an error saying `Invalid argument 0, expected number"

ArgumentsImpl needs a rewrite of checkX and isX for numbers to be more permissive/proper in light of JNLua now passing Longs and such around.

(This is another OC 1.8.0+ regression, so downgrading to OC 1.7.7 should be fine for now.)