Is this a bug report?

Yup.

Have you read the Contributing Guidelines?

Yup.

Environment

OS: OS X El Capitan 10.11.6
Node: 7.10.0
Yarn: 0.24.6
npm: 4.2.0
Watchman: 4.9.0
Xcode: Xcode 8.2.1 Build version 8C1002
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0 => 16.0.0
react-native: 0.50.1 => 0.50.1

Steps to Reproduce

Use a flatlist with a viewabilityConfig.viewAreaCoveragePercentThreshold prop set to any value.
e.g: viewabilityConfig={{ viewAreaCoveragePercentThreshold: 50 }}.

<View>
    <FlatList
      data={[{a: foo}, {b: bar}, {c: foobar}]}
      viewabilityConfig={{ viewAreaCoveragePercentThreshold: 50 }}
    />
</View>

Expected Behavior

Normal use of a viewabilityConfig prop on a FlatList.

Actual Behavior

Use of viewabilityConfig throws errors caused by checks introduced in the following commit: ad733ad

Get Invariant violations, testing for equality, console.log spits out equal values, throws error regardless.

FlatList.js (425-428):

invariant(
      nextProps.viewabilityConfig === this.props.viewabilityConfig,
      'Changing viewabilityConfig on the fly is not supported',
);

Reproducible Demo

Can't reproduce error on snack.