Represents the "P" entry of the linearization parameter dictionary object.

It is an optional entry defined as part of the PDF 1.2 specification.

It contains an integer representing a PDF numeric object.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: f.1, page 680.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: f.1, page 878.

The P entry gives the zero-based page index of the first page as defined by the linearization, typically 0 but may differ if the document is linearized with a different opening page.