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MRG: standardize on u32 for scaled, and introduce `ScaledType` #5829

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Run time

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Job	Run time
mamba (ubuntu-latest)	10m 8s
nix (ubuntu-latest)	19m 35s
mamba (macos-14)	7m 18s
nix (macos-14)	15m 48s
pixi (ubuntu-latest)	9m 55s
pixi (macos-14)	7m 10s
	1h 9m 54s