diff --git a/src/generators/nodes/Binding.ts b/src/generators/nodes/Binding.ts
index 6b1b74bd93..4aca1807e0 100644
--- a/src/generators/nodes/Binding.ts
+++ b/src/generators/nodes/Binding.ts
@@ -92,7 +92,7 @@ export default class Binding extends Node {
 
 		// special cases
 		if (this.name === 'group') {
-			const bindingGroup = getBindingGroup(this.compiler, this.value);
+			const bindingGroup = getBindingGroup(this.compiler, this.value.node);
 
 			block.builders.hydrate.addLine(
 				`#component._bindingGroups[${bindingGroup}].push(${node.var});`
@@ -267,7 +267,7 @@ function getValueFromDom(
 
 	// <input type='checkbox' bind:group='foo'>
 	if (binding.name === 'group') {
-		const bindingGroup = getBindingGroup(compiler, binding.value);
+		const bindingGroup = getBindingGroup(compiler, binding.value.node);
 		if (type === 'checkbox') {
 			return `@getBindingGroupValue(#component._bindingGroups[${bindingGroup}])`;
 		}
diff --git a/src/generators/nodes/shared/Expression.ts b/src/generators/nodes/shared/Expression.ts
index 010ae3c446..a75ba23940 100644
--- a/src/generators/nodes/shared/Expression.ts
+++ b/src/generators/nodes/shared/Expression.ts
@@ -15,7 +15,13 @@ export default class Expression {
 	indexes: Set<string>;
 
 	constructor(compiler, parent, scope, info) {
-		this.compiler = compiler;
+		// TODO revert to direct property access in prod?
+		Object.defineProperties(this, {
+			compiler: {
+				value: compiler
+			}
+		});
+
 		this.node = info;
 
 		this.snippet = `[✂${info.start}-${info.end}✂]`;
diff --git a/src/generators/nodes/shared/Node.ts b/src/generators/nodes/shared/Node.ts
index e0afb53409..b66220372d 100644
--- a/src/generators/nodes/shared/Node.ts
+++ b/src/generators/nodes/shared/Node.ts
@@ -17,11 +17,20 @@ export default class Node {
 	var: string;
 
 	constructor(compiler: Generator, parent, scope, info: any) {
-		this.compiler = compiler;
-		this.parent = parent;
 		this.start = info.start;
 		this.end = info.end;
 		this.type = info.type;
+
+		// this makes properties non-enumerable, which makes logging
+		// bearable. might have a performance cost. TODO remove in prod?
+		Object.defineProperties(this, {
+			compiler: {
+				value: compiler
+			},
+			parent: {
+				value: parent
+			}
+		});
 	}
 
 	cannotUseInnerHTML() {
diff --git a/src/utils/flattenReference.ts b/src/utils/flattenReference.ts
index a2303bca34..7e000875db 100644
--- a/src/utils/flattenReference.ts
+++ b/src/utils/flattenReference.ts
@@ -1,6 +1,7 @@
 import { Node } from '../interfaces';
 
 export default function flattenReference(node: Node) {
+	if (node.type === 'Expression') throw new Error('bad');
 	const parts = [];
 	const propEnd = node.end;