diff --git a/README.md b/README.md
index 4638fa31..6ddbbb0a 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 -->8.22 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 -->8.29 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/dangerfile.js b/dangerfile.js
index 89ea4277..bd9cd30b 100644
--- a/dangerfile.js
+++ b/dangerfile.js
@@ -43,6 +43,8 @@ if(appfiles.length && !changelog) {
 // Call out if `o.only(...)` was left in
 jsfiles
 	.filter((file) => file.indexOf("tests/") > -1)
+	// Have to exclude test-ospec.js because it specifically has a purposeful "o.only" in it
+	.filter((file) => file.indexOf("test-ospec") === -1)
 	.forEach((file) => {
 		var code = fs.readFileSync(file, "utf8"),
 			locs = locater.find("o.only", code);
diff --git a/docs/change-log.md b/docs/change-log.md
index 64c727c8..82686f0e 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -26,6 +26,8 @@
 #### Bug fixes
 
 - API: `m.route.set()` causes all mount points to be redrawn ([#1592](https://github.com/MithrilJS/mithril.js/pull/1592))
+- API: If a user sets the Content-Type header within a request's options, that value will be the entire header value rather than being appended to the default value ([#1924](https://github.com/MithrilJS/mithril.js/pull/1924))
+- API: Using style objects in hyperscript calls will now properly diff style properties from one render to another as opposed to re-writing all element style properties every render.
 
 ---
 
diff --git a/docs/route.md b/docs/route.md
index a8f7a2fe..8706119e 100644
--- a/docs/route.md
+++ b/docs/route.md
@@ -107,7 +107,7 @@ This function can be used as the `oncreate` (and `onupdate`) hook in a `m("a")`
 m("a[href=/]", {oncreate: m.route.link})`.
 ```
 
-Using `m.route.link` as a `oncreate` hook causes the link to behave as a router link (i.e. it navigates to the route specified in `href`, instead of nagivating away from the current page to the URL specified in `href`.
+Using `m.route.link` as a `oncreate` hook causes the link to behave as a router link (i.e. it navigates to the route specified in `href`, instead of navigating away from the current page to the URL specified in `href`.
 
 If the `href` attribute is not static, the `onupdate` hook must also be set:
 
diff --git a/mithril.js b/mithril.js
index 77e3c6d9..e2c8944e 100644
--- a/mithril.js
+++ b/mithril.js
@@ -274,10 +274,10 @@ var _8 = function($window, Promise) {
 				_abort.call(xhr)
 			}
 			xhr.open(args.method, args.url, typeof args.async === "boolean" ? args.async : true, typeof args.user === "string" ? args.user : undefined, typeof args.password === "string" ? args.password : undefined)
-			if (args.serialize === JSON.stringify && useBody) {
+			if (args.serialize === JSON.stringify && useBody && !(args.headers && args.headers.hasOwnProperty("Content-Type"))) {
 				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
 			}
-			if (args.deserialize === deserialize) {
+			if (args.deserialize === deserialize && !(args.headers && args.headers.hasOwnProperty("Accept"))) {
 				xhr.setRequestHeader("Accept", "application/json, text/*")
 			}
 			if (args.withCredentials) xhr.withCredentials = args.withCredentials
@@ -905,6 +905,18 @@ var coreRenderer = function($window) {
 	}
 	//style
 	function updateStyle(element, old, style) {
+		if (old != null && style != null && typeof old === "object" && typeof style === "object" && style !== old) {
+			// Both old & new are (different) objects.
+			// Update style properties that have changed
+			for (var key2 in style) {
+				if (style[key2] !== old[key2]) element.style[key2] = style[key2]
+			}
+			// Remove style properties that no longer exist
+			for (var key2 in old) {
+				if (!(key2 in style)) element.style[key2] = ""
+			}
+			return
+		}
 		if (old === style) element.style.cssText = "", old = null
 		if (style == null) element.style.cssText = ""
 		else if (typeof style === "string") element.style.cssText = style
@@ -913,11 +925,6 @@ var coreRenderer = function($window) {
 			for (var key2 in style) {
 				element.style[key2] = style[key2]
 			}
-			if (old != null && typeof old !== "string") {
-				for (var key2 in old) {
-					if (!(key2 in style)) element.style[key2] = ""
-				}
-			}
 		}
 	}
 	//event
diff --git a/mithril.min.js b/mithril.min.js
index c68ee276..05686d0c 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,44 +1,44 @@
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+e,a)}null!=e.instance?(null==c.instance?f(l,e.instance,a,g,b):k(l,c.instance,e.instance,a,b,d,g),e.dom=e.instance.dom,e.domSize=e.instance.domSize):null!=c.instance?(z(c.instance,null),e.dom=void 0,e.domSize=0):(e.dom=c.dom,e.domSize=c.domSize)}}else z(c,null),f(l,e,a,g,b)}function r(l){var c=l.domSize;if(null!=c||null==l.dom){var a=x.createDocumentFragment();if(0<c){for(l=l.dom;--c;)a.appendChild(l.nextSibling);a.insertBefore(l,a.firstChild)}return a}return l.dom}function g(a,c,b){for(;c<a.length;c++)if(null!=
+a[c]&&null!=a[c].dom)return a[c].dom;return b}function n(a,c,b){b&&b.parentNode?a.insertBefore(c,b):a.appendChild(c)}function p(a){var c=a.children;if(null!=c&&1===c.length&&"<"===c[0].tag)c=c[0].children,a.dom.innerHTML!==c&&(a.dom.innerHTML=c);else if(null!=a.text||null!=c&&0!==c.length)throw Error("Child node of a contenteditable must be trusted");}function a(a,c,b,d){for(;c<b;c++){var l=a[c];null!=l&&(l.skip?l.skip=!1:z(l,d))}}function z(a,c){function b(){if(++d===l&&(u(a),a.dom)){var b=a.domSize||
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+(e.style[f]="")}else if(a===d&&(e.style.cssText="",a=null),null==d)e.style.cssText="";else if("string"===typeof d)e.style.cssText=d;else for(f in"string"===typeof a&&(e.style.cssText=""),d)e.style[f]=d[f];else if(c in e&&"href"!==c&&"list"!==c&&"form"!==c&&"width"!==c&&"height"!==c&&void 0===g&&!(a.attrs.is||-1<a.tag.indexOf("-"))){if("value"===c){f=""+d;if(("input"===a.tag||"textarea"===a.tag)&&a.dom.value===f&&a.dom===x.activeElement)return;if("select"===a.tag)if(null===d){if(-1===a.dom.selectedIndex&&
+a.dom===x.activeElement)return}else if(null!==b&&a.dom.value===f&&a.dom===x.activeElement)return;if("option"===a.tag&&null!=b&&a.dom.value===f)return}"input"===a.tag&&"type"===c?e.setAttribute(c,d):e[c]=d}else"boolean"===typeof d?d?e.setAttribute(c,""):e.removeAttribute(c):e.setAttribute("className"===c?"class":c,d)}}function w(a){return"oninit"===a||"oncreate"===a||"onupdate"===a||"onremove"===a||"onbeforeremove"===a||"onbeforeupdate"===a}function G(a,c,b){var e=a.dom,d="function"!==typeof D?b:function(a){var c=
+b.call(e,a);D.call(e,a);return c};if(c in e)e[c]="function"===typeof b?d:null;else{var g=c.slice(2);void 0===a.events&&(a.events={});a.events[c]!==d&&(null!=a.events[c]&&e.removeEventListener(g,a.events[c],!1),"function"===typeof b&&(a.events[c]=d,e.addEventListener(g,a.events[c],!1)))}}function A(a,c,b){"function"===typeof a.oninit&&a.oninit.call(c.state,c);"function"===typeof a.oncreate&&b.push(a.oncreate.bind(c.state,c))}function I(a,c,b){"function"===typeof a.onupdate&&b.push(a.onupdate.bind(c.state,
+c))}var x=b.document,J=x.createDocumentFragment(),O={svg:"http://www.w3.org/2000/svg",math:"http://www.w3.org/1998/Math/MathML"},D;return{render:function(a,c){if(!a)throw Error("Ensure the DOM element being passed to m.route/m.mount/m.render is not undefined.");var b=[],d=x.activeElement,g=a.namespaceURI;null==a.vnodes&&(a.textContent="");Array.isArray(c)||(c=[c]);h(a,a.vnodes,y.normalizeChildren(c),!1,b,null,"http://www.w3.org/1999/xhtml"===g?void 0:g);a.vnodes=c;for(g=0;g<b.length;g++)b[g]();x.activeElement!==
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+a):a.onmatch?T.resolve(a.onmatch(b,d)).then(function(b){f(a,b)},z):f(a,"div")},z)};n.set=function(b,a,d){null!=g&&(d=d||{},d.replace=!0);g=null;f.setPath(b,a,d)};n.get=function(){return r};n.prefix=function(b){f.prefix=b};n.link=function(b){b.dom.setAttribute("href",f.prefix+b.attrs.href);b.dom.onclick=function(a){a.ctrlKey||a.metaKey||a.shiftKey||2===a.which||(a.preventDefault(),a.redraw=!1,a=this.getAttribute("href"),0===a.indexOf(f.prefix)&&(a=a.slice(f.prefix.length)),n.set(a,void 0,void 0))}};
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diff --git a/render/render.js b/render/render.js
index 6bebd212..f6782297 100644
--- a/render/render.js
+++ b/render/render.js
@@ -552,6 +552,18 @@ module.exports = function($window) {
 
 	//style
 	function updateStyle(element, old, style) {
+		if (old != null && style != null && typeof old === "object" && typeof style === "object" && style !== old) {
+			// Both old & new are (different) objects.
+			// Update style properties that have changed
+			for (var key in style) {
+				if (style[key] !== old[key]) element.style[key] = style[key]
+			}
+			// Remove style properties that no longer exist
+			for (var key in old) {
+				if (!(key in style)) element.style[key] = ""
+			}
+			return
+		}
 		if (old === style) element.style.cssText = "", old = null
 		if (style == null) element.style.cssText = ""
 		else if (typeof style === "string") element.style.cssText = style
@@ -560,11 +572,6 @@ module.exports = function($window) {
 			for (var key in style) {
 				element.style[key] = style[key]
 			}
-			if (old != null && typeof old !== "string") {
-				for (var key in old) {
-					if (!(key in style)) element.style[key] = ""
-				}
-			}
 		}
 	}
 
diff --git a/render/tests/test-updateElement.js b/render/tests/test-updateElement.js
index 313fe1a9..a2ae0fcb 100644
--- a/render/tests/test-updateElement.js
+++ b/render/tests/test-updateElement.js
@@ -192,6 +192,19 @@ o.spec("updateElement", function() {
 		o(updated.dom.style.backgroundColor).equals("")
 		o(updated.dom.style.color).equals("gold")
 	})
+	o("does not re-render element styles for equivalent style objects", function() {
+		var style = {color: "gold"}
+		var vnode = {tag: "a", attrs: {style: style}}
+
+		render(root, [vnode])
+
+		root.firstChild.style.color = "red"
+		style = {color: "gold"}
+		var updated = {tag: "a", attrs: {style: style}}
+		render(root, [updated])
+
+		o(updated.dom.style.color).equals("red")
+	})
 	o("replaces el", function() {
 		var vnode = {tag: "a"}
 		var updated = {tag: "b"}
diff --git a/request/request.js b/request/request.js
index ac5f3391..7e4ec744 100644
--- a/request/request.js
+++ b/request/request.js
@@ -67,10 +67,10 @@ module.exports = function($window, Promise) {
 
 			xhr.open(args.method, args.url, typeof args.async === "boolean" ? args.async : true, typeof args.user === "string" ? args.user : undefined, typeof args.password === "string" ? args.password : undefined)
 
-			if (args.serialize === JSON.stringify && useBody) {
+			if (args.serialize === JSON.stringify && useBody && !(args.headers && args.headers.hasOwnProperty("Content-Type"))) {
 				xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
 			}
-			if (args.deserialize === deserialize) {
+			if (args.deserialize === deserialize && !(args.headers && args.headers.hasOwnProperty("Accept"))) {
 				xhr.setRequestHeader("Accept", "application/json, text/*")
 			}
 			if (args.withCredentials) xhr.withCredentials = args.withCredentials
diff --git a/test-utils/tests/test-xhrMock.js b/test-utils/tests/test-xhrMock.js
index 8bdfcf21..8c64a308 100644
--- a/test-utils/tests/test-xhrMock.js
+++ b/test-utils/tests/test-xhrMock.js
@@ -72,6 +72,14 @@ o.spec("xhrMock", function() {
 			}
 			xhr.send("a=b")
 		})
+		o("Setting a header twice merges the header", function() {
+			// Source: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
+			var xhr = new $window.XMLHttpRequest()
+			xhr.open("POST", "/test")
+			xhr.setRequestHeader("Content-Type", "foo")
+			xhr.setRequestHeader("Content-Type", "bar")
+			o(xhr.getRequestHeader("Content-Type")).equals("foo, bar")
+		})
 	})
 	o.spec("jsonp", function() {
 		o("works", function(done) {
diff --git a/test-utils/xhrMock.js b/test-utils/xhrMock.js
index d3bbf5b8..379bce28 100644
--- a/test-utils/xhrMock.js
+++ b/test-utils/xhrMock.js
@@ -17,7 +17,17 @@ module.exports = function() {
 			var headers = {}
 			var aborted = false
 			this.setRequestHeader = function(header, value) {
-				headers[header] = value
+				/*
+				 the behavior of setHeader is not your expected setX API.
+				 If the header is already set, it'll merge with whatever you add
+				 rather than overwrite
+				 Source: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
+				 */
+				if (headers[header]) {
+					headers[header] += ", " + value;
+				} else {
+					headers[header] = value
+				}
 			}
 			this.getRequestHeader = function(header) {
 				return headers[header]