Add support for notation to currency format styles (#449)

Sources/FoundationInternationalization/Formatting/Number/Decimal+FormatStyle.swift

@@ -235,6 +235,17 @@ extension Decimal.FormatStyle {
             return new
         }
 
+        /// Modifies the format style to use the specified notation.
+        ///
+        /// - Parameter notation: The notation to apply to the format style.
+        /// - Returns: A decimal currency format style modified to use the specified notation.
+        @available(FoundationPreview 0.4, *)
+        public func notation(_ notation: Configuration.Notation) -> Self {
+            var new = self
+            new.collection.notation = notation
+            return new
+        }
+
         // FormatStyle
         public func format(_ value: Decimal) -> String {
             if let f = ICUCurrencyNumberFormatter.create(for: self), let res = f.format(value) {

Sources/FoundationInternationalization/Formatting/Number/FloatingPointFormatStyle.swift

@@ -201,6 +201,17 @@ extension FloatingPointFormatStyle {
             new.collection.presentation = p
             return new
         }
+
+        /// Modifies the format style to use the specified notation.
+        ///
+        /// - Parameter notation: The notation to apply to the format style.
+        /// - Returns: A floating-point currency format style modified to use the specified notation.
+        @available(FoundationPreview 0.4, *)
+        public func notation(_ notation: Configuration.Notation) -> Self {
+            var new = self
+            new.collection.notation = notation
+            return new
+        }
     }
 }
 

Sources/FoundationInternationalization/Formatting/Number/IntegerFormatStyle.swift

@@ -201,6 +201,17 @@ extension IntegerFormatStyle {
             new.collection.presentation = p
             return new
         }
+
+        /// Modifies the format style to use the specified notation.
+        ///
+        /// - Parameter notation: The notation to apply to the format style.
+        /// - Returns: An integer currency format style modified to use the specified notation.
+        @available(FoundationPreview 0.4, *)
+        public func notation(_ notation: Configuration.Notation) -> Self {
+            var new = self
+            new.collection.notation = notation
+            return new
+        }
     }
 }
 

Sources/FoundationInternationalization/Formatting/Number/NumberFormatStyleConfiguration.swift

@@ -312,6 +312,9 @@ public enum CurrencyFormatStyleConfiguration {
     public typealias Precision = NumberFormatStyleConfiguration.Precision
     public typealias DecimalSeparatorDisplayStrategy = NumberFormatStyleConfiguration.DecimalSeparatorDisplayStrategy
     public typealias RoundingRule = NumberFormatStyleConfiguration.RoundingRule
+    /// The type used to configure notation for currency format styles.
+    @available(FoundationPreview 0.4, *)
+    public typealias Notation = NumberFormatStyleConfiguration.Notation
 
     internal typealias RoundingIncrement = NumberFormatStyleConfiguration.RoundingIncrement
     internal struct Collection : Codable, Hashable {
@@ -323,6 +326,7 @@ public enum CurrencyFormatStyleConfiguration {
         var rounding: RoundingRule?
         var roundingIncrement: RoundingIncrement?
         var presentation: Presentation
+        var notation: Notation?
     }
 
     public struct SignDisplayStrategy: Codable, Hashable, Sendable {
@@ -842,6 +846,9 @@ extension CurrencyFormatStyleConfiguration.Collection {
         if let rounding = rounding {
             s += rounding.skeleton + " "
         }
+        if let notation = notation {
+            s += notation.skeleton + " "
+        }
 
         return s._trimmingWhitespace()
     }