Add mount condition for playbackRate and volume

src/compiler/compile/render_dom/wrappers/Element/Binding.ts

@@ -140,6 +140,7 @@ export default class BindingWrapper {
 			case 'playbackRate':
 			case 'volume':
 				update_conditions.push(x`!@_isNaN(${this.snippet})`);
+				mount_conditions.push(x`!@_isNaN(${this.snippet})`);
 				break;
 
 			case 'paused':

test/js/samples/media-bindings/expected.js

@@ -58,8 +58,14 @@ function create_fragment(ctx) {
 		},
 		m(target, anchor) {
 			insert(target, audio, anchor);
-			audio.volume = ctx.volume;
-			audio.playbackRate = ctx.playbackRate;
+
+			if (!isNaN(ctx.volume)) {
+				audio.volume = ctx.volume;
+			}
+
+			if (!isNaN(ctx.playbackRate)) {
+				audio.playbackRate = ctx.playbackRate;
+			}
 		},
 		p(changed, ctx) {
 			if (!audio_updating && changed.currentTime && !isNaN(ctx.currentTime)) {