prevent hanging with large numbers of links (#604)

test/apps/export/src/routes/boom/[a]/[b].svelte

@@ -0,0 +1,12 @@
+<script context="module">
+	export function preload({ params }) {
+		return params;
+	}
+</script>
+
+<script>
+	export let a;
+	export let b;
+</script>
+
+<p>{a}/{b}</p>

test/apps/export/src/routes/boom/[a]/index.svelte

@@ -0,0 +1,15 @@
+<script context="module">
+	export function preload({ params }) {
+		return params;
+	}
+</script>
+
+<script>
+	export let a;
+
+	const list = Array(20).fill().map((_, i) => i + 1);
+</script>
+
+{#each list as b}
+	<a href="boom/{a}/{b}">{a}/{b}</a>
+{/each}

test/apps/export/src/routes/boom/index.svelte

@@ -0,0 +1,7 @@
+<script>
+	const list = Array(20).fill().map((_, i) => i + 1);
+</script>
+
+{#each list as a}
+	<a href="boom/{a}">{a}</a>
+{/each}

test/apps/export/src/routes/index.svelte

@@ -7,3 +7,4 @@
 <a href= >empty anchor #4</a>
 <a href>empty anchor #5</a>
 <a>empty anchor #6</a>
+<a href="boom">boom</a>