Async validation fails if promise resolved with some data

[afitiskin]

What is the current behavior?

We have a form with async validation (same as in Async Blur Validation Example)

We have a following validation function:

const asyncValidate = (values/*, dispatch */) => {
  return sleep(1000)
    .then(() => {
      return new Promise((resolve, reject) => {
        if ([ 'john', 'paul', 'george', 'ringo' ].includes(values.username)) {
          reject({ username: 'That username is taken' })
        } else {
          resolve('You shall not pass!')
        }
      })
    })
}

In case of success validation, promise is resolved with some data (in our case just string You shall not pass!).

Async validation works just fine, but submitting of the form is impossible.
Error in console after submit: (index):1 Uncaught (in promise) You shall not pass!

What is the expected behavior?

Async validation returns promise, if promise is resolved (no matter with or without data provided) – async validation should pass and form submission should work as usual.

Sandbox Link

Live example: https://redux-form-broken-validation.herokuapp.com/
Live example source code: https://github.com/afitiskin/redux-form/tree/broken-async-validation-example/examples/brokenAsyncValidation

What's your environment?

Latest versions of packages and browsers

It is a duplicate of #2056 with formal bug report.

[afitiskin]

Added live example to codesandbox: https://codesandbox.io/s/vo2mj9y8y

[erikras]

Fix released in v7.4.0.

[lock]

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