Is x/crypto/chacha20poly1305 thread-safe?

Technical Discussion
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Regarding the package in x/crypto that implements the chacha20poly1305 AEAD: golang.org/x/crypto/chacha20poly1305

Looking at the code, the only field in the AEAD’s struct is for the key, which is never updated during encryption/decryption. Should the documentation be updated to indicate that the Cipher is thread-safe? Or is that too much to promise for backwards compatibility?

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