Alignment issue at 43.10. Trigger Functions

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Page: https://www.postgresql.org/docs/13/plpgsql-trigger.html
Description:

Type alignment issue for salary at "Example 43.4. A PL/pgSQL Trigger
Function for Auditing":

CREATE TABLE emp_audit(
    operation         char(1)   NOT NULL,
    stamp             timestamp NOT NULL,
    userid            text      NOT NULL,
    empname           text      NOT NULL,
    salary integer
);