should not consider precision of function inputs

[uladkasach]

postgres does not retain input type precision, likely because it does not matter

e.g.,

CREATE OR REPLACE FUNCTION upsert_postal_to_geocode(
  in_postal varchar,
  in_latitude numeric(9, 6),
  in_longitude numeric(9, 6)
)

is output back as

CREATE OR REPLACE FUNCTION upsert_postal_to_geocode(
  in_postal varchar,
  in_latitude numeric,
  in_longitude numeric
)

we should ignore the precision too