Default sanitizer does not work with checkSchema when checking query

[nikli2009]

Describe the bug

Given this schema.

const schema = {
      foo: {
        default: {
          options: 10,
        },
      },
}

and this route

app.use('/test', checkSchema(schema), testController)

When request /test?foo or /test?foo=, the default option does not work.

To Reproduce

As described above. 👆👆

Expected behavior

the request query : req.query should be transformed to

{ foo: 10 }

Current behavior

the request query : req.query is

{ }

Express-validator version:

• Version: 6.12.1