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As requested on the mailing list:
Document the kind of integer passed for string lengths
| The character length variables you mention are always (for gfortran)
| 32-bit integer signed variables, so if you need to address them in
| gfortran, you can use either integer(kind=4) or, in C99, int32_t
| (found in header inttypes.h).
See PR34528 also.