Hard/preferred size bounds a provider imposes on multipart transfer parts
for an entry of the given total size (e.g. S3 requires a minimum part size
and caps the total number of parts at 10000, so a very large entry needs a
larger part size than a small one). Returned by
IOProvider.getPartSizeConstraints; the framework reconciles
source and sink bounds to pick a single negotiated part size.
Hard/preferred size bounds a provider imposes on multipart transfer parts for an entry of the given total size (e.g. S3 requires a minimum part size and caps the total number of parts at 10000, so a very large entry needs a larger part size than a small one). Returned by IOProvider.getPartSizeConstraints; the framework reconciles source and sink bounds to pick a single negotiated part size.