Inheriting from Argument() in order to represent the id of a UDF runtime object as obtainable by list_udf_runtimes().
Object of R6Class() is an argument that expects a UDF runtime version or character as value.
Array(), Integer(), EPSGCode(), String(), Number(),
Date(), RasterCube(), VectorCube(), ProcessGraphArgument(),
ProcessGraphParameter(), OutputFormatOptions(), GeoJson(),
Boolean(), DateTime(), Time(), BoundingBox(), Kernel(),
TemporalInterval(), TemporalIntervals(), CollectionId(), OutputFormat(),
AnyOf(), ProjDefinition(), UdfCodeArgument(), UdfRuntimeArgument() and
UdfRuntimeVersionArgument(),TemporalIntervals(), MetadataFilter()