Cann't save uint64 , error: "value is greater than maximum value for Int4"

Hi,
I want to save the value of a uint64 variable in a table, the target column type is "BIGINT", but I get the error "868957043361742 is greater than maximum value for Int4"
I have no error when I save this value directly in the table.
I used pgxpool.Pool to connect to the database

Start at the pgxpool.Pool parameter handling and reproduce saving uint64 value 868957043361742 into a PostgreSQL BIGINT column. Trace why the value is treated as Int4; done when the value saves successfully without the maximum-value error and the behavior is covered by a regression test.

Written by the indexing model from the issue text.