Text shadow doesn't render when blur is set but offset is (0,0)

[Firehed]

Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS High Sierra 10.13.1
Node: 8.9.0
Yarn: 1.3.2
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.0.1 Build version 9A1004
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: ^0.49.3 => 0.49.5

Steps to Reproduce

<Text style={{
    textShadowOffset: { height: 0, width: 0 },
    textShadowColor: 'red',
    textShadowRadius: 3,
}}>This text should have a shadow</Text>

Expected Behavior

Text should have a blurred shadow with no offset, similar to having text-shadow: 0 0 3px red in CSS.

Actual Behavior

No shadow exists at all

Reproducible Demo

https://snack.expo.io/B1X1Lzvff

Other

At least on iOS, I think the issue is an overly-grabby conditional in Libraries/Text/RCTShadowText.m, something like if (!CGSizeEqualToSize(_textShadowOffset, CGSizeZero) || _textShadowRadius != 0.0) {. Not too sure about the build process so I can't easily test that fix locally. Plus it seems to occur on Android as well.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. If you think this issue should definitely remain open, please let us know why. Thank you for your contributions.

[mcmar]

@shergin @mdvacca @davidaurelio Can one of you please re-open this or otherwise respond? I can confirm the issue and it does not appear to be intended behavior. Compare to text-shadow prop on web browsers, where the following is perfectly valid and displays the intended behavior:
text-shadow: 0 0 2px #FF0000;