Represents the "PrimaryText" entry of the collection colors dictionary object.

It is an optional entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains an array which contains doubles, representing PDF numeric objects.

Items in this array should have a minimum value of 0 and a maximum of 1.

For definitive details see:.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.6a, page 31.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 157, page 450.