fix: pipeToPath should truncate the file

Author: dsherret

src/request.test.ts

@@ -168,6 +168,8 @@ Deno.test("$.request", (t) => {
       const originDir = Deno.cwd();
       try {
         {
+          // ensure that a truncate happens
+          $.path(testFilePath).writeTextSync("text".repeat(1002));
           const downloadedFilePath = await new RequestBuilder()
             .url(new URL("/text-file", serverUrl))
             .showProgress()

src/request.ts

@@ -626,6 +626,7 @@ export class RequestResponse {
       const file = await filePath.open({
         write: true,
         create: true,
+        truncate: true,
         ...(options ?? {}),
       });
       try {