We shouldn't need to initialize subclasses of Arrays twice. 
https://bugs.webkit.org/show_bug.cgi?id=186811
Summary We shouldn't need to initialize subclasses of Arrays twice.
Keith Miller
Reported 2018-06-19 12:06:06 PDT
We initialize subclasses of Array because we might need to allocate a new structure to change indexing types during initialization. If this triggered a GC then we might scan our currently uninitialized array and crash. If we had a GCDeferralContext then we could avoid this.
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