uniq(1) use isspace(3b) instead of isblank(3) to parse field separator.

following code:

       for (nfields = numfields, infield = 0; nfields && *str; ++str)
               if (isspace((unsigned char)*str)) {
                       if (infield) {
                               infield = 0;
               } else if (!infield)
                       infield = 1;

but spec says: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uniq.html

-f  fields
Ignore the first fields fields on each input line when doing comparisons, where fields is a positive decimal integer. A field is the maximal string matched by the basic regular expression:
[[:blank:]]*[^[:blank:]]*

If the fields option-argument specifies more fields than appear on an input line, a null string shall be used for comparison.

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