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atttypmod encoding

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Catalog pg_attribute contains interesting type-specific information in attribute atttypmod. Can someone verify that these encodings are correct?

CHAR and VARCHAR: 4 + the declared length. Example: CHAR(5) -> 9 in atttypmod
NUMERIC(p,s): 4 + the long with p in the left-most 4 bytes and s in the right-most

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