Public functions without tests
These symbols were not removed while working on #157 (closed) (dead code removal), because they appear in public headers and are not prefix by
sion_free_io_info sion_set_fp_closed sion_get_dfile sion_isdebug sion_debug_off sion_generic_register_get_multi_filename_cb
They should probably be called from the test suite.
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