diff --git a/README.md b/README.md
index fa0159a9..881fab6e 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.86 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.89 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 567d2c4c..5f87c706 100644
--- a/mithril.js
+++ b/mithril.js
@@ -41,7 +41,8 @@ function compileSelector(selector) {
 }
 function execSelector(state, attrs, children) {
 	var hasAttrs = false, childList, text
-	var className = attrs.className || attrs.class
+	var classAttr = hasOwn.call(attrs, "class") ? "class" : "className"
+	var className = attrs[classAttr]
 	if (!isEmpty(state.attrs) && !isEmpty(attrs)) {
 		var newAttrs = {}
 		for(var key in attrs) {
@@ -52,19 +53,19 @@ function execSelector(state, attrs, children) {
 		attrs = newAttrs
 	}
 	for (var key in state.attrs) {
-		if (hasOwn.call(state.attrs, key)) {
+		if (hasOwn.call(state.attrs, key) && key !== "className" && !hasOwn.call(attrs, key)){
 			attrs[key] = state.attrs[key]
 		}
 	}
-	if (className !== undefined) {
-		if (attrs.class !== undefined) {
-			attrs.class = undefined
-			attrs.className = className
-		}
-		if (state.attrs.className != null) {
-			attrs.className = state.attrs.className + " " + className
-		}
-	}
+	if (className != null || state.attrs.className != null) attrs.className =
+		className != null
+			? state.attrs.className != null
+				? state.attrs.className + " " + className
+				: className
+			: state.attrs.className != null
+				? state.attrs.className
+				: null
+	if (classAttr === "class") attrs.class = null
 	for (var key in attrs) {
 		if (hasOwn.call(attrs, key) && key !== "key") {
 			hasAttrs = true
@@ -76,7 +77,7 @@ function execSelector(state, attrs, children) {
 	} else {
 		childList = children
 	}
-	return Vnode(state.tag, attrs.key, hasAttrs ? attrs : undefined, childList, text)
+	return Vnode(state.tag, attrs.key, hasAttrs ? attrs : null, childList, text)
 }
 function hyperscript(selector) {
 	if (selector == null || typeof selector !== "string" && typeof selector !== "function" && typeof selector.view !== "function") {
diff --git a/mithril.min.js b/mithril.min.js
index 414d2792..71795996 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,48 +1,48 @@
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