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Apparently I'm in the minority, but if a single chunk of functionality legitimately needs a thousand lines of code, I'd rather see it all up front than have to review 5 separate PRs that don't do anything until they're combined.

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A good middle ground is to have a large PR open for reference, and then split sections of it out into separate PRs. This way you get nice reviewable chunks while also having the broader context.

This is similar to stacked PRs except that it's much easier to tweak things as you split them out without rebase shenanigans although of course if you tweak too much it kind of defeats the point of the whole thing.

A nice thing about this is that you can put the large PR up while it's still very draft for conceptual review (socialisatuon etc etc) while you work on splitting out and polishing parts of it.

If a massive PR can't be broken up into multiple small but meaningful sub-PRs then it's normally good manners to say something like 'here's what I want to change, this is why it needs changing, and I think it needs this massive overhaul which touches these million and one things'. But I don't think that's a likely scenario unless a codebase is poorly designed and the prevailing wisdom of 'to make a difficult change: first make the change easy, then make the easy change' will usually be applicable.

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