Unable to style input element with the new classNames API in 5.7

In PR https://github.com/JedWatson/react-select/pull/5457 the classNames API was added - but I think the input one is not correct?

Previously, the below styling for an "input" would target the <input /> element:

.re-select__input {
  /* whatever */
}

<Select classNamePrefix="re-select" />

However the below code instead targets the input-container div around it:

<Select classNames={{ input: () => 'whatever' }} />

I think its a mistake in here? https://github.com/JedWatson/react-select/pull/5457/files#diff-07753302222b58b652fb23698902955708f7f700fdeecf15980423588766fef4R107-R112

Possible you need to expose input and inputContainer separately, not sure how to style the input as before with classNames