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CFCharacterSet: implement CFCharacterSetHasMemberInPlane - #96
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The function was a stub that always returned false. Check whether any of the sets code point ranges intersects the requested plane.
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CFCharacterSetHasMemberInPlane was a stub that always returned false. It now walks
the set's code point ranges and reports whether any of them intersects the
requested plane (plane N spans U+N0000 through U+NFFFF). Verified against Apple
CoreFoundation.