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Improving Message struct description #620

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Harshil-Jani
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Fixes #619

/// Message is invalid if
/// - Message has no content or has a length of zero.
/// - Message length doesn't match the expected size.
/// - Non hased message is passed as input.
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I think this comment is confusing. It's impossible for the length to differ from 32 bytes (which I guess is the "expected size"?) so it's impossible for a message to be invalid in this way.

"Non-hashed message" is also not very precisely defined. It's fine to tell people that this should always be the output of a hash function, and to point them to the [ThirtyTwoByteHash] trait (or whatever it's called) to help them with this, but it's not "invalid" otherwise because it's not well-defined what is the output of a hash function and what is not.

Invalid values are ones that will cause signature signing and verification to fail every time.

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Ah I see. So can I write it like below instead of invalid ?

/// A valid Message is always of 32 Bytes.

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Improve definition of the Message struct
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