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> You will be forced to lug this broken behavior with you forever

Yep, welcome to my life.

Wouldn't that broken behaviour be a potential security issue by itself?

I do remember Go making backwards incompatible changes in some rare scenarios like that.

(and technically the loopvar fix was a big backwards incompatible change; granted that was done with a lot of consideration)

Wouldn't a nil ECDSA key be a security risk?

If a private key is available, the public key can be derived from the private key using scalar multiplication. This is how ecdsa.GenerateKey works by itself - it first generates a private key from the provided random byte stream and then derives a public key from that private key.

I don't see how this can be a security risk, but allowing a public key that has a curve but a nil value is definitely a messy API.

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