Represents the "FDecodeParms" entry of the stream object.
It is an optional entry defined as part of the PDF 1.2
It contains an array which contains ParameterElements.
If you read the specification you will see that an array of one
be represented as a single ParameterElement
rather than an array. However we always present this property as an
array to simplify the interface. It is only if you add or remove
items in the array, that the underlying representation will be
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 5, page
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 5, page 32.