Represents the "HI" entry of the software identifier dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a bool representing a PDF boolean object.

The PDF specification states that this item assumes a value of true if no value has been provided.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 292, page 504.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 303, page 631.

The HI entry, when true, makes the upper version bound inclusive: the maximum version itself is acceptable. When false, only versions strictly below the maximum are acceptable.