I wrote:
> I think the easiest way to fix this is to forget about the special
> initialization at outer level and just always initialize a new stack level
> to have the same hash as its parent.  That leads to the first patch below
> --- but once you look at that, you realize that we've got unnecessarily
> many copies of stack->parent->hash into stack->hash, so what I actually
> propose now is the second patch below.

Meh, that wasn't quite right either --- need to reset stack->hash after
processing a sub-object, not only after a scalar VALUE.  I think what I
committed is OK though.

                        regards, tom lane

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