As an intermediate step between soft fork and hard fork, what is a software upgrade that can run multiple versions compatiblely?

Question: As an intermediate step between soft fork and hard fork, what is a software upgrade that can run multiple versions compatiblely?

A software upgrade that can run multiple versions compatibly is called a sidechain. It is a mechanism that allows for the transfer of assets from one blockchain to another, while still being able to use the original blockchain's native currency. Sidechains are often used as an intermediate step between soft forks and hard forks. 

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