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(parent: ba19b23) | patch

Fix numeric_maximum_size() calculation.

Fix numeric_maximum_size() calculation.

The old computation can sometimes underestimate the necessary space
by 2 bytes; however we're not back-patching this, because this result
isn't used for anything critical. Per discussion with Tom Lane,
make the typmod test in this function match the ones in numeric()
and apply_typmod() exactly.

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