[Python] opencv-python opening 16 bit exr image as 32 bit exr

I have an EXR image that is 16-bit, but when I open it using OpenCV-Python and print its dtype, I get float32.

import numpy
import os
os.environ["OPENCV_IO_ENABLE_OPENEXR"] = "1"
import cv2
path="D:\\image.exr"

imageToInvert = cv2.imread(path, cv2.IMREAD_UNCHANGED)
print(image.dtype)


I then thought of converting 32bit float to 16 bit float using:

newImage=imageToInvert.astype(numpy.float16)

but when I try to save it:

cv2.imwrite("./test.exr",newImage)

It throws

cv2.error: OpenCV(4.11.0) D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp:849: error: (-215:Assertion failed) encoder->isFormatSupported(CV_8U) in function 'cv::imwrite_'```

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