• jbroman's avatar
    ValueSerializer: Distinguish between 'undefined' and an absent property. · dc85f4c8
    jbroman authored
    Dealing with this case requires a wire format change. It is possible that an
    element can be absent even in an array where the dense format was chosen
    (because the array initially had no holes), if the elements are modified while
    they are being serialized. In this case, a new tag for the "hole" is emitted.
    
    The logic to treat undefined in dense arrays as an absent property is restricted
    to versions of the wire format that this tag did not exist.
    
    BUG=chromium:686159,chromium:665820
    
    Review-Url: https://codereview.chromium.org/2660093002
    Cr-Commit-Position: refs/heads/master@{#42784}
    dc85f4c8
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