merge revision(s) 35e124832e29b65c84d4e0e4e434616859f9bdf5: [Backport #20755]
[Bug #20755] Frozen string should not be writable via IO::Buffer
merge revision(s) 35e124832e29b65c84d4e0e4e434616859f9bdf5: [Backport #20755]