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There isn't support for ISO speed ratings in exif_entry_fix(), exif_entry_get_value() and exif_entry_initialize().
If using it, the library always produces broken tag.
I attach the patch that fixes the issue.
EXIF_TAG_ISO_SPEED_RATINGS initialization patch
See also https://sourceforge.net/tracker/?func=detail&aid=1884609&group_id=12272&atid=112272