fix: prevent duplicates

packages/svelte/src/internal/server/index.js

@@ -205,8 +205,10 @@ export function spread_attributes(attrs, css_hash, classes, styles, flags = 0) {
 		if (!ignore_defaults) {
 			if (name === 'defaultvalue') {
 				name = 'value';
+				if (attrs[name]) continue;
 			} else if (name === 'defaultchecked') {
 				name = 'checked';
+				if (attrs[name]) continue;
 			}
 		}
 

packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/_config.js

@@ -5,5 +5,6 @@ export default test({
 	html: `
 		<input value="a">
 		<input type="checkbox" checked>
+		<input value="b">
 `
 });

packages/svelte/tests/runtime-runes/samples/form-default-value-from-spread/main.svelte

@@ -4,4 +4,5 @@
 </script>
 
 <input {...text} />
-<input type="checkbox" {...checkbox} />
+<input type="checkbox" {...checkbox} />
+<input value="b" {...text} />