fix(s3 paths): pathing differences now correctly handled in a reducePath method.

test/test.ts

@@ -79,7 +79,7 @@ tap.test('prepare for directory style tests', async () => {
     contents: 'dir3/dir4/file1.txt content',
   });
   await myBucket.fastPut({
-    path: 'file1.txt',
+    path: '/file1.txt',
     contents: 'file1 content',
   });
 });