Page will not load in Instagram Browser with ecmascript@0.14.3

Hello,

When loading a webpage specifically on an apple iPhone in instagram the page will not load with ecmascript@0.14.3 loaded.. a downgrade to ecmascript@0.14.2 will load with no problem

Start by reproducing the failure on an Apple iPhone in Instagram's browser with ecmascript@0.14.3, then compare it with ecmascript@0.14.2. The issue does not name a source file or test, so identify the changed package entry point or release behavior before narrowing the fix. Done means the page loads in the reported environment without regressing the older browser support.

Written by the indexing model from the issue text.