Removes the property from the workbook.
The property's name. Unique within the workbook, ignoring case.
The defined name the value is linked to ("Link to content"), or null when it is not linked.
VBA's DocumentProperty.LinkSource. Carried from the file: SheetXL does not refresh the value
from the name, and setValue keeps the link.
The kind of value, chosen by setValue from the value it is given.
The property's value. A ICustomProperty.Type.Date property returns a Date.
Sets getValue, and with it getType: a whole number that fits in 32 bits is a ICustomProperty.Type.Number, any other number a ICustomProperty.Type.Float.
For persisting.
A property a user or an application added to the workbook: a name and a value. Saved with the workbook; it affects nothing else.
Remarks
Shaped after Office Scripts'
CustomProperty.See
IDocumentProperties.getCustom