Split formatters by domain (iOS)#325
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Reduce CurrencyFormatter to pure fiat formatting. Extract domain-specific formatters with non-overlapping responsibilities: - PercentFormatter — proper percent style with sign-strategy, replaces the .percent/.percentSignLess types on CurrencyFormatter. - NumericFormatter — Double-input formatting with optional unit suffix and locale-aware parsing (was string(double:symbol:) / double(from:) hacks). - AbbreviatedFormatter — made public, used directly where K/M/B is needed. - CurrencyFormatter — only fiat currency display (.currency / .fiat / .abbreviated). Internals on Double.FormatStyle. Shared precision constants, thresholds, and adaptive(for:) selector live in one Precision extension. CurrencyFormatter.precision tuple-switch flattened to a nested switch (no anonymous patterns). ValueFormatter unchanged vs main except threshold-name aliases (twoPlaces → upToTwoPlaces, fourPlaces → upToFourPlaces) to disambiguate from CurrencyFormatter's pad-zeros twoPlaces.
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Reduce CurrencyFormatter to pure fiat formatting. Extract domain-specific formatters with non-overlapping responsibilities:
Shared precision constants, thresholds, and adaptive(for:) selector live in one Precision extension. CurrencyFormatter.precision tuple-switch flattened to a nested switch (no anonymous patterns).
ValueFormatter unchanged vs main except threshold-name aliases (twoPlaces → upToTwoPlaces, fourPlaces → upToFourPlaces) to disambiguate from CurrencyFormatter's pad-zeros twoPlaces.