fix: Safety guard on random(negative)

Author: Pazaz

src/engine/script/handlers/NumberOps.ts

@@ -30,12 +30,12 @@ const NumberOps: CommandHandlers = {
     },
 
     [ScriptOpcode.RANDOM]: state => {
-        const a = state.popInt();
+        const a = Math.max(0, state.popInt());
         state.pushInt(JavaRandom.nextInt(a));
     },
 
     [ScriptOpcode.RANDOMINC]: state => {
-        const a = state.popInt();
+        const a = Math.max(0, state.popInt());
         state.pushInt(JavaRandom.nextInt(a + 1));
     },
 

src/util/JavaRandom.ts

@@ -57,7 +57,7 @@ function next(bits: number) {
 
 function checkIsPositiveInt(n: number, r = Number.MAX_SAFE_INTEGER) {
     if (n < 0 || n > r) {
-        throw RangeError();
+        throw RangeError('number must be > 0');
     }
 }