Represents the "I" entry of the border effect dictionary object.

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

It contains a double representing a PDF numeric object.

It should have a minimum value of 0 and a maximum of 2.

The PDF specification states that this item assumes a value of 0 if no value has been provided.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 167, page 387.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 169, page 470.