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Represents the "TU" entry of the field dictionary object.
It is an optional entry defined as part of the PDF 1.3
specification.
It contains a string representing a PDF string object.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 220,
page 433.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 226, page 527.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 222,
page 434.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 228, page 529.
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