Support for BorshDeserialize and BorshSerialize

[ivanceras]

Hi, is there any plan to support BorshSerialize and BorshDeserialize for the ethereum-types.
I notice that borsh is used in NEAR and in Solana which provides compatibility with ethereum.

[ordian]

Hey @ivanceras. If there's enough demand for it, we might consider adding this feature. However, that would mean tying any major releases to a breaking change to ethereum-types, which we'd like to avoid.

[sloboste]

Borsh support would be useful to hyperlane and eclipse.

@ordian to address your concern about avoiding being tied to breaking changes - given that borsh is still in 0.x, what do you think about feature gating borsh support behind an experimental-impl-borsh feature and documenting explicitly that there may be breaking changes to anything related to borsh?

[ordian]

@sloboste hey, sorry for the long delay in reply. I think your suggestion is a reasonable workaround we can live with.

[tkporter]

@ordian would love to see #698 get merged with the feature gate :) are there any changes you'd like to see there?

[ordian]

@tkporter yes, see point 2 in #698 (comment). Instead of introducing a new crate with a regular macro, we could just use derive with a feature gate.