failing assert in memory manager

import QtQuick 2.0
Item {
  Component.onCompleted: {
    var foo, chars;
    foo = new Array(250000 + 1).join('x');
    foo = new Array(264000 + 1).join('x');
    chars = foo.split('');
    chars = foo.split('');
    chars = foo.split('');
  }
}

ASSERT: "availableBytes >= size" in file /Users/erik/dev/qt5.9/qtdeclarative/src/qml/memory/qv4mm.cpp, line 195

* thread #1: tid = 0x1a1c46, 0x00007fff9464bd42 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff9464bd42 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff94739457 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x00007fff945b1420 libsystem_c.dylib`abort + 129
    frame #3: 0x0000000106aa138d libQt5Core_debug.5.dylib`QtNS::qt_message_fatal((null)=QtFatalMsg, context=0x00007fff5fbf8cc0, message=0x00007fff5fbf8a00) + 29 at qlogging.cpp:1690
    frame #4: 0x0000000106aa4fd1 libQt5Core_debug.5.dylib`QtNS::QMessageLogger::fatal(this=0x00007fff5fbf8cc0, msg="ASSERT: \"%s\" in file %s, line %d") const + 657 at qlogging.cpp:796
    frame #5: 0x0000000106a8764c libQt5Core_debug.5.dylib`QtNS::qt_assert(assertion="availableBytes >= size", file="/Users/erik/dev/qt5.9/qtdeclarative/src/qml/memory/qv4mm.cpp", line=195) + 300 at qglobal.cpp:3080
    frame #6: 0x0000000104b822b8 libQt5Qml_debug.5.dylib`QtNS::QV4::MemorySegment::allocate(this=0x00006190000f87c8, size=4198400) + 200 at qv4mm.cpp:195
    frame #7: 0x0000000104b7faa2 libQt5Qml_debug.5.dylib`QtNS::QV4::ChunkAllocator::allocate(this=0x00006030000991f0, size=4198400) + 1954 at qv4mm.cpp:246
    frame #8: 0x0000000104b89aa7 libQt5Qml_debug.5.dylib`QtNS::QV4::HugeItemAllocator::allocate(this=0x000061300009bb58, size=4194368) + 407 at qv4mm.cpp:636
    frame #9: 0x0000000104b8fc38 libQt5Qml_debug.5.dylib`QtNS::QV4::MemoryManager::allocData(this=0x000061300009ba80, size=4194368) + 280 at qv4mm.cpp:764
    frame #10: 0x000000010516ffb2 libQt5Qml_debug.5.dylib`QtNS::QV4::SimpleArrayData::Data* QtNS::QV4::MemoryManager::allocManaged<QtNS::QV4::SimpleArrayData>(this=0x000061300009ba80, size=4194368) + 50 at qv4mm_p.h:218
    frame #11: 0x00000001051f46eb libQt5Qml_debug.5.dylib`QtNS::QV4::ArrayData::realloc(o=0x0000000116422418, newType=Simple, requested=262145, enforceAttributes=false) + 1995 at qv4arraydata.cpp:151
    frame #12: 0x0000000104ee5db1 libQt5Qml_debug.5.dylib`QtNS::QV4::Object::arrayReserve(this=0x0000000116422418, n=262145) + 33 at qv4object_p.h:317
    frame #13: 0x00000001052af88d libQt5Qml_debug.5.dylib`QtNS::QV4::Object::push_back(this=0x0000000116422418, v=0x0000000116422428) + 61 at qv4object_p.h:487
    frame #14: 0x00000001052d4012 libQt5Qml_debug.5.dylib`QtNS::QV4::StringPrototype::method_split((null)=0x00000001164223f8, scope=0x00007fff5fbfa4c0, callData=0x00000001164223a0) + 5122 at qv4stringobject.cpp:735
    frame #15: 0x000000010524df88 libQt5Qml_debug.5.dylib`QtNS::QV4::BuiltinFunction::call(that=0x00000001164223f8, scope=0x00007fff5fbfa4c0, callData=0x00000001164223a0) + 344 at qv4functionobject.cpp:484
    frame #16: 0x0000000104eee4d2 libQt5Qml_debug.5.dylib`QtNS::QV4::Object::call(this=0x00000001164223f8, scope=0x00007fff5fbfa4c0, d=0x00000001164223a0) const + 114 at qv4object_p.h:372
    frame #17: 0x000000010545b779 libQt5Qml_debug.5.dylib`QtNS::QV4::Runtime::method_callProperty(engine=0x000061a00003c080, nameIndex=10, callData=0x00000001164223a0) + 2201 at qv4runtime.cpp:1108
    frame #18: 0x0000000110d57762
    frame #19: 0x00000001051af84c libQt5Qml_debug.5.dylib`QtNS::QV4::ExecutionContext::simpleCall(this=0x0000000110d56038, scope=0x00007fff5fbfb0c0, callData=0x0000000116422328, function=0x00006040000bc010) + 3052 at qv4context.cpp:347
    frame #20: 0x0000000105707b1f libQt5Qml_debug.5.dylib`QtNS::QQmlJavaScriptExpression::evaluate(this=0x000060c00005a580, callData=0x0000000116422328, isUndefined=0x0000000000000000, scope=0x00007fff5fbfb0c0) + 2415 at qqmljavascriptexpression.cpp:223
    frame #21: 0x0000000105544823 libQt5Qml_debug.5.dylib`QtNS::QQmlBoundSignalExpression::evaluate(this=0x000060c00005a580, a=0x0000000000000000) + 3715 at qqmlboundsignal.cpp:223
    frame #22: 0x0000000105545ba4 libQt5Qml_debug.5.dylib`QtNS::QQmlBoundSignal_callback(e=0x0000606000160100, a=0x0000000000000000) + 1300 at qqmlboundsignal.cpp:355
    frame #23: 0x00000001056972ad libQt5Qml_debug.5.dylib`QtNS::QQmlNotifier::emitNotify(endpoint=0x0000000000000000, a=0x0000000000000000) + 2205 at qqmlnotifier.cpp:106
    frame #24: 0x00000001054c4752 libQt5Qml_debug.5.dylib`QtNS::QQmlData::signalEmitted((null)=0x000060d00004efb0, object=0x00006030000a7c20, index=3, a=0x0000000000000000) + 2898 at qqmlengine.cpp:854
    frame #25: 0x0000000107384804 libQt5Core_debug.5.dylib`QtNS::QMetaObject::activate(sender=0x00006030000a7c20, signalOffset=3, local_signal_index=0, argv=0x0000000000000000) + 804 at qobject.cpp:3644
    frame #26: 0x00000001073844cd libQt5Core_debug.5.dylib`QtNS::QMetaObject::activate(sender=0x00006030000a7c20, m=0x0000000105a8a7c0, local_signal_index=0, argv=0x0000000000000000) + 61 at qobject.cpp:3629
    frame #27: 0x00000001058dfa52 libQt5Qml_debug.5.dylib`QtNS::QQmlComponentAttached::completed(this=0x00006030000a7c20) + 34 at moc_qqmlcomponentattached_p.cpp:138
    frame #28: 0x000000010576d1df libQt5Qml_debug.5.dylib`QtNS::QQmlObjectCreator::finalize(this=0x00006120000994c0, interrupt=0x00007fff5fbfe0a0) + 3407 at qqmlobjectcreator.cpp:1335
    frame #29: 0x000000010552117b libQt5Qml_debug.5.dylib`QtNS::QQmlComponentPrivate::complete(enginePriv=0x0000616000076280, state=0x00006110000e9f60) + 411 at qqmlcomponent.cpp:920
    frame #30: 0x000000010551bf4f libQt5Qml_debug.5.dylib`QtNS::QQmlComponentPrivate::completeCreate(this=0x00006110000e9ec0) + 207 at qqmlcomponent.cpp:956
    frame #31: 0x0000000105521452 libQt5Qml_debug.5.dylib`QtNS::QQmlComponent::completeCreate(this=0x000060200003f9d0) + 34 at qqmlcomponent.cpp:949
    frame #32: 0x000000010551f30a libQt5Qml_debug.5.dylib`QtNS::QQmlComponent::create(this=0x000060200003f9d0, context=0x000060200003f9f0) + 650 at qqmlcomponent.cpp:775
    frame #33: 0x0000000100008591 qmlscene`main(argc=2, argv=0x00007fff5fbff9b0) + 13697 at main.cpp:578
    frame #34: 0x00007fff9451d235 libdyld.dylib`start + 1