defineProperty should consider that descriptor.value is undefined when calling handleChangeOnTarget
Hi there again :'D,
currently I am running into a strange Bug in combination with VUE.
VUE defines its own properties on an object but does not define a value on the propertyDescriptor.
on-change's defineProperty (line 132) method is assuming, that this is always set. In my case the "current" value is determined in a wrong way so that it is always undefined at the first time. You should check with
if ("value" in descriptor)if it is avalable and use descriptor.get() otherwise
maybe it has to be checked earlyer to be sure that there is a change or not.
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