wip payload conversion

[Manishearth]

Take 2 at #1512

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Notice: the branch changed across the force-push!

• Cargo.lock is now changed in the branch
• provider/core/Cargo.toml is different
• provider/core/src/dynutil.rs is different

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Notice: the branch changed across the force-push!

• provider/cldr/src/transform/datetime/patterns.rs is now changed in the branch
• provider/cldr/src/transform/datetime/skeletons.rs is now changed in the branch
• provider/cldr/src/transform/datetime/symbols.rs is now changed in the branch
• provider/cldr/src/transform/datetime/week_data.rs is now changed in the branch
• provider/cldr/src/transform/decimal/mod.rs is now changed in the branch
• provider/cldr/src/transform/list/mod.rs is now changed in the branch
• provider/cldr/src/transform/locale_canonicalizer/aliases.rs is now changed in the branch
• provider/cldr/src/transform/locale_canonicalizer/likely_subtags.rs is now changed in the branch
• provider/cldr/src/transform/plurals/mod.rs is now changed in the branch
• provider/cldr/src/transform/time_zones/mod.rs is now changed in the branch
• provider/core/src/datagen/data_conversion.rs is now changed in the branch
• provider/core/src/datagen/heap_measure.rs is now changed in the branch
• provider/core/src/datagen/mod.rs is now changed in the branch
• provider/core/src/dynutil.rs is different
• provider/core/src/fork/by_key.rs is different
• provider/core/src/lib.rs is different

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[sffc]

Looks great so far!