Represents the "Encode" entry of the type 3 function dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

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

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 41, page 97.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 41, page 127.

The Encode array maps each sub-function's portion of the stitching domain to the input domain of that sub-function. Each pair of values gives the encoded input at the subdomain minimum and maximum. This allows sub-functions defined over [0, 1] to be used without modification.