[bug #38474] Unintended (?) behaviour change of -perm +mode predicate

[Eric Blake]

Follow-up Comment #6, bug #38474 (project findutils):

> POSIX only calls out symbolic mode, not numeric mode

Well, POSIX also calls out numeric mode:

-perm [−]onum
 If the <hyphen> is omitted, the primary shall evaluate as true when the file
mode
bits exactly match the value of the octal number onum (see the description of
the
octal mode in chmod). Otherwise, if onum is prefixed by a <hyphen>, the
primary
shall evaluate as true if at least all of the bits specified in onum are set.
In both
cases, the behavior is unspecified when onum exceeds 07777.

But there is no mention of parsing a '+' when deciding if a value is an onum.

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