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We seem to be missing documentation for TIFFCleanup(). As it seems to be mostly for closing tiff files opened by TIFFFdOpen(), we should probably add another entry point called TIFFFdClose() that simply calls TIFFCleanup(). Arose from discussion at http://www.asmail.be/msg0055359906.html
Bugzilla is no longer used for tracking libtiff issues. Remaining open tickets, such as this one, have been migrated to the libtiff GitLab instance at https://gitlab.com/libtiff/libtiff/issues . The migrated tickets have their summary prefixed with [BZ#XXXX] where XXXX is the initial Bugzilla issue number.