const crypto/tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
one use
crypto/tls (current package)
cipher_suites.go#L723: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
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