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73d02c3b3e
Partially reverts 846b647953: instead of
throwing, this skips uninitialized typed properties when serializing objects.
This makes serialize with __sleep() behave the same as serialize()
without __sleep().
As in the non-__sleep() case, unserialize(serialize($x)) identity
may not be preserved due to replacement of uninitialized/unset
properties with default values. Fixing this will require changes to
the serialization format.
Closes GH-5396.