feat: some behavioral fixes

src/main/java/me/topchetoeu/jscript/compilation/VariableDeclareNode.java

@@ -30,9 +30,22 @@ public class VariableDeclareNode extends Node {
 	}
 	@Override public void compile(CompileResult target, boolean pollute) {
 		for (var entry : values) {
+			var index = target.scope.get(entry.var.name, false);
+
 			if (entry.value != null) {
 				entry.value.compile(target, true);
-				target.add(VariableNode.toSet(target, loc(), entry.var.name, false, true)).setLocation(loc());
+			}
+
+			if (index == null) {
+				if (entry.value == null) {
+					target.add(Instruction.globDef(entry.var.name));
+				}
+				else {
+					target.add(Instruction.globSet(entry.var.name, false, true));
+				}
+			}
+			else if (entry.value != null) {
+				target.add(index.index().toSet(false));
 			}
 		}
 

src/main/java/me/topchetoeu/jscript/compilation/values/RegexNode.java

@@ -32,6 +32,7 @@ public class RegexNode extends Node {
 		var inBrackets = false;
 
 		loop: while (true) {
+			if (i + n >= src.size()) break;
 			switch (src.at(i + n)) {
 				case '[':
 					inBrackets = true;

src/main/java/me/topchetoeu/jscript/runtime/values/functions/FunctionValue.java

@@ -115,7 +115,7 @@ public abstract class FunctionValue extends ObjectValue {
 		this.length = length;
 		this.name = name;
 
-		prototype.defineOwnField(null, "constructor", this);
+		prototype.defineOwnField(null, "constructor", this, true, false, true);
 	}
 }