I've made the unfortunate mistake of failing to take compiler padding
into account in the structures I've been using for HDF5 compound types.
This has had the even more unfortunate result of making fill value
elements not actually compare with the fill value (due to the pad bytes
having different values, though this seems to occur only when a dataset
has fill values explicitly written to disk as part of an output buffer).
My investigation has given indications that the pad bytes are being
stored in the HDF5 file, which surprises me a bit. Is that the case?
Should I pay rather more attention to optimizing my structures to
mitigate padding?
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