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Bug
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    Resolution: Incomplete
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  Not Evaluated                     
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    None
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    5.3.0 RC1
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    None
 
in some cases, while deleting or creating large objects, the application crashes at Value::isObject() or Value::isString() in qv4value_inl_p.h
Adding more guards to the pointers in those functions seems to solve the crash (see attached patch).