Introduce a required `#[borsh(use_discriminant = true|false)]` enum attribute when discriminants are specified about borsh-rs HOT 4 CLOSED

One thing worth noting here is that to make it as painless as possible for users, ideally code would detect if enum has discriminants specified. So #[derive(BorshSerialize)] enum Foo { A, B } would compile but #[derive(BorshSerialize)] enum Foo { A = 10, B } wouldn’t.

By the way, another use case for the annotation is enum Foo { A = 256 } which cannot be serialised when discriminants are used.

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@iho I suggest you take this one next.

cc @mina86

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@mina86 I tried to do as you suggested by detecting explicit discriminate and emitting compiler errors. #148

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closed by #183

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