xarray_to_cdf FILLVAL Error

[anamanica]

xarray_to_cdf is creating corrupt cdf files when reading in FILLVAL attributes as strings.

• This issue arose when writing code for the IMAP mission--particularly the IDEX instrument. FILLVAL was written as -1.0E+31 rather than -1.0e+31, and xarray_to_cdf did not raise an error. Rather, the function load_cdf in imap_processing.utils.py caught the issue giving a ValueError that "the buffer is smaller than the requested size."

Below is linked a .py file with a simple version of this bug where two written tests fail. The files used to illustrate this are testing_corrupt_cdf.py and imap_idex_l1_attrs.yaml both in imap_processing/tests.
https://github.com/anamanica/imap_processing/blob/corrupt-cdf/imap_processing/tests/testing_corrupt_cdf.py