followup data-allow-mismatch: data-mismatch-prefer-ssr

[OrbisK]

Folllowup on: 94fb2b8

Currently, mismatches remove and correct the nodes on the client. This sometimes causes flashes. Ideally, I would like to have the option to allow this mismatch and keep the server-side rendered node for the initial hydration.

This would be really helpful when handling things like relative time formats.

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_{I am not sure if all the mismatches should support "prefer SSR". I can imagine there being problems with mismatches in the number of children.}