Feat/237 mpt trie ext to branch collapse error #455
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- While `Nibbles::default()` already does this, I think having an explicit method that makes an empty `Nibbles` is a bit cleaner, even if it's a bit redundant.
- Unsafe, as if the extension was pointing to a (hashed) leaf, then we must collapse the extension into the leaf. - However, because the leaf is hashed, we can not tell that the hash node is from a leaf and also can not extract the leaf's key. - It's the user's responsibility to ensure that this scenario never occurs, so we need to return an error when it does.
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0xaatif
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Ugh, how did I do that? I meant too just remove the changes of the calls to |
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Should be good now. 👍 |
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* Added `Nibbles::empty()` - While `Nibbles::default()` already does this, I think having an explicit method that makes an empty `Nibbles` is a bit cleaner, even if it's a bit redundant. * Now returns an error if we collapse an `E --> H` - Unsafe, as if the extension was pointing to a (hashed) leaf, then we must collapse the extension into the leaf. - However, because the leaf is hashed, we can not tell that the hash node is from a leaf and also can not extract the leaf's key. - It's the user's responsibility to ensure that this scenario never occurs, so we need to return an error when it does. * Requested PR changes for #455
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Resolves #237.
Also slipped in a QoL method
Nibbles::empty(), which maybe should have been a separate PR (sorry!). I felt that an explicitemptymethod was a bit more clear than callingNibbles::default()whenever we wanted an emptyNibbles.