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Exposure corrections problem

Hello, Im working on project making HDR photo out of RAW images by making 3 samples with different exposures. Overexposing the image by setting values exp_shift between 2.0 and 8.0 works great but the underexposing values just arn't working. Setting them to 0.5 or 0.25 and it makes no difference on the result between it and input image.
Normal process - unpack(), dcraw_process(), dcraw_make_mem_image()