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Remove SSZ unions #3906

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Remove SSZ unions #3906

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tersec
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@tersec tersec commented Aug 29, 2024

SSZ unions are not used and have never been used in any version of deployed consensus-layer Ethereum. Align spec with this.

@ralexstokes
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unions were used in very old versions of sharding specs, and its possible we could use them in future iterations of the spec

instead of deleting them, we could add a note that they are not part of a "core" or "minimum required functionality" SSZ implementation

@ralexstokes
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another data point:

Portal uses unions in their networking specs here: https://github.com/ethereum/portal-network-specs/blob/master/portal-wire-protocol.md

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