(flags eddsa) and (flags gost)

[NIIBE Yutaka]

Hello,

Currently, we use (flags eddsa) or (flags gost) with (data ...) to be
signed or to be encrypted/decrypted.

However, I think that it is the curve parameter.  I mean, for a
particular curve, if it's for EdDSA, data always needs to have (flags
eddsa).

Are there any use cases, where a curve not intended to EdDSA will be
used with (data (flags eddsa)...)?

It seems for me that (flags gost) is same.

If this is true, should we get such a flag from curve, instead of from
data?
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