firely-net-sdk
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Add support for adding (and subtracting) date quantities from dates
(see https://github.com/FirelyTeam/firely-net-sdk/issues/2431#issuecomment-1744681689)
I would like to add to this that executing the examples in https://hl7.org/fhirpath/N1/#subtraction-2, also provides an error in the FHIRPath playground.
This can be worked around by adding a '+' to the fhirpath.