[BitBucket user: Joël Spaltenstein]
[BitBucket date: 2018-04-16.14:05:46]

As odd as it might seem, the specification calls for Integer String and Decimal String to be saved to JSON as Numbers.

See specification:
http://dicom.nema.org/medical/dicom/current/output/html/part18.html#sect_F.2.3

dcm4che enforces this specification, which makes orthanc JSON responses incompatible with dcm4che.