Structure of `require.cache` is altered with ncc

Given this index.js:

console.log(require.cache);

Invoke with node index.js:

[Object: null prototype] {
  '/private/tmp/ncc/index.js':
   Module {
     id: '.',
     exports: {},
     parent: null,
     filename: '/private/tmp/ncc/index.js',
     loaded: false,
     children: [],
     paths:
      [ '/private/tmp/ncc/node_modules',
        '/private/tmp/node_modules',
        '/private/node_modules',
        '/node_modules' ] } }

with ncc run index.js:

2kB  index.js
2kB  [641ms]
{ '406': { i: 406, l: false, exports: {} } }

The structure is altered, which cause cache cleaning libs like decache or clear-module failed. Is this intentional or unexpected?

Start with the minimal index.js example and compare require.cache under node index.js and ncc run index.js. Review how the reported decache and clear-module libraries consume the cache structure; done means documenting whether the altered structure is intentional or making the behavior compatible with those cache-cleaning libraries.