Rename flatData -> dataForExtents?

[mhkeller]

Per, #53 (comment), would it make more sense to rename the flatData to dataForExtents? It speaks more to what it's used for, which is a little less mysterious than describing what it must be.

This would be a breaking change but we can still support flatData for a little bit so things wouldn't actually break. I'm just about ready to publish version 6.0.0, which is the svelte-kit version. There are no other changes though – just figured it would be good to bump the major version in case it breaks a build process or something.

[techniq]

I like the explicitness, although I have used flatData in other contexts beyond extents within LayerChart / my projects. It's useful to know you have long vs wide data in those contexts like Tooltips (there might also be some opportunity to use $data vs $flatData though).

I would need to refactor my use of flatData if so. I kind of prefer how it is now, but also understand the potential confusion and would be fine with the change either way.

[albertsun]

flatData feels better to me I think, it's the data but passed through flatten or something like that. And while it's used for extents it could also be used for other things, whereas if it were called dataForExtents it might suggest that it's an array with just the four min/max points.

[mhkeller]

Good points @techniq and @albertsun! Let's keep flatData! Thanks for weighing in!