blob: use Clamp conversion in Blob slice

Align Blob.prototype.slice() with the File API Web IDL definition by
using [Clamp] conversion for the start and end arguments.

This fixes the Blob-slice.any.js WPT expected failures for fractional
start and end values.

Refs: https://www.w3.org/TR/FileAPI/#dfn-Blob
Signed-off-by: HoonDongKang <d159123@naver.com>

Author: HoonDongKang

lib/internal/blob.js

@@ -261,11 +261,11 @@ class Blob {
 
     start = converters['long long'](
       start,
-      { __proto__: null, context: 'start' },
+      { __proto__: null, context: 'start', clamp: true },
     );
     end = converters['long long'](
       end,
-      { __proto__: null, context: 'end' },
+      { __proto__: null, context: 'end', clamp: true },
     );
 
     if (start < 0) {

test/wpt/status/FileAPI/blob.cjs

@@ -36,16 +36,4 @@ module.exports = {
   'Blob-in-worker.worker.js': {
     skip: 'Depends on Web Workers API',
   },
-  'Blob-slice.any.js': {
-    fail: {
-      expected: [
-        'Slicing test: slice (1,1).',
-        'Slicing test: slice (1,3).',
-        'Slicing test: slice (1,5).',
-        'Slicing test: slice (1,7).',
-        'Slicing test: slice (1,8).',
-        'Slicing test: slice (1,9).',
-      ],
-    },
-  },
 };