@TYPE2@ const FcCharSet * @ARG2@ b
@PURPOSE@ Merge charsets
@DESC@
-If <parameter>a</parameter> is NULL, returns a copy of <parameter>b</parameter>.
+If <parameter>a</parameter> is NULL, returns a newly-created copy of <parameter>b</parameter>.
If <parameter>a</parameter> is an FcCharSet object owned by fontconfig that
cannot be modified, it returns the union of <parameter>a</parameter> and
<parameter>b</parameter> in a newly-created FcCharSet object.