ONIG_SYN_CONTEXT_INDEP_REPEAT_OPS not working for ^* pattern

[sargas]

docs/SYNTAX.md has this to say about ONIG_SYN_CONTEXT_INDEP_REPEAT_OPS:

ONIG_SYN_CONTEXT_INDEP_REPEAT_OPS (independent ?, *, +, {n,m})

Set in: Oniguruma, PosixExtended, GnuRegex, Java, Perl, Perl_NG, Ruby

This flag specifies how to handle operators like ? and * when they aren't
directly attached to an operand, as in ^* or (*): Are they an error, are
they discarded, or are they taken as literals? If this flag is clear, they
are taken as literals; otherwise, the ONIG_SYN_CONTEXT_INVALID_REPEAT_OPS flag
determines if they are errors or if they are discarded.

Since this flag isn't set for "grep", I used the sample.c example changing the syntax to ONIG_SYNTAX_GREP and the str to (UChar* )"*zzzzaffffffffb" (note the initial asterisk).

For a pattern of * or \\(*\\), the first character matches (as expected).
For a pattern of ^*, I get "ERROR: target of repeat operator is invalid", despite this being exactly the example regular expression in the documentation saying the asterisk should be treated as a literal.

[sargas]

Thanks for the fast response!