fix(markdown): normalize non-finite render chunk limits

src/markdown/render-aware-chunking.test.ts

@@ -70,4 +70,17 @@ describe("renderMarkdownIRChunksWithinLimit", () => {
 
     expect(chunks.map((chunk) => chunk.source.text)).toEqual(["README.md", "<"]);
   });
+
+  it("normalizes non-finite limits before chunking", () => {
+    const ir = markdownToIR("abc");
+    const chunks = renderMarkdownIRChunksWithinLimit({
+      ir,
+      limit: Number.NaN,
+      renderChunk: renderEscapedHtml,
+      measureRendered: (rendered) => rendered.length,
+    });
+
+    expect(chunks.map((chunk) => chunk.source.text)).toEqual(["a", "b", "c"]);
+    expect(chunks.every((chunk) => chunk.rendered.length <= 1)).toBe(true);
+  });
 });

src/markdown/render-aware-chunking.ts

@@ -1,3 +1,4 @@
+import { resolveIntegerOption } from "../shared/number-coercion.js";
 import {
   chunkMarkdownIR,
   sliceMarkdownIR,
@@ -30,7 +31,7 @@ export function renderMarkdownIRChunksWithinLimit<TRendered>(
     return [];
   }
 
-  const normalizedLimit = Math.max(1, Math.floor(options.limit));
+  const normalizedLimit = resolveIntegerOption(options.limit, 1, { min: 1 });
   const pending = chunkMarkdownIR(options.ir, normalizedLimit);
   const finalized: MarkdownIR[] = [];
 
@@ -196,7 +197,7 @@ function splitMarkdownIRPreserveWhitespace(ir: MarkdownIR, limit: number): Markd
     return [];
   }
 
-  const normalizedLimit = Math.max(1, Math.floor(limit));
+  const normalizedLimit = resolveIntegerOption(limit, 1, { min: 1 });
   if (normalizedLimit <= 0 || ir.text.length <= normalizedLimit) {
     return [ir];
   }