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e854b38872
Fixes #4631 This introduces a mechanism by which parsed config fields can be renamed to maintain backwards compatibility. This already has a use case -- implemented in this commit -- for `background-blur-radius` to be renamed to `background-blur`. The remapping is comptime-known which lets us do some comptime validation. The remap check isn't done unless no fields match which means for well-formed config files, there's no overhead. For future improvements: - We should update our config help generator to note renamed fields. - We could offer automatic migration of config files be rewriting them. - We can enrich the value type with more metadata to help with config gen or other tooling.