This function returns `0` if the two `berval` structures are equivalent. It returns a negative
value if `L` is shorter than `R`, and a
positive value if `L` is longer than `R`.
If `L` and `R` are of the same size but
their content differs, this function returns a negative value if `L` is
less than `R`, or a positive value if `L` is
greater than `R`, where `L` and `R` are
compared as arrays of bytes.

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