BUG: Fix error in JSON serialization
BUG: Fix error in JSON serialization

Currently, the standard JSON encoder does not serialize int16 and throws a type error. To prevent this, ensure that image and mask diagnostics return type float (for features, this is already the case).

Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics