Handle title case words after initialisms

Sources/Spices/Internal/String+Helpers.swift

@@ -13,15 +13,26 @@ extension String {
         var pieces = [String]()
         var currentPiece = ""
 
-        for (idx, character) in enumerated() {
-            if idx == 0 {
+        for (idx, character) in zip(indices, self) {
+            if idx == startIndex {
                 currentPiece += character.uppercased()
             } else if character.isUppercase {
                 // Small check: recognize runs of multiple uppercase letters and
-                // consider them part of the same word.
-                if let previousChar = currentPiece.last, previousChar.isUppercase {
+                // consider them part of the same word until the start of the next word.
+                let previousIndex = index(before: idx)
+                let nextIndex = index(after: idx)
+                let previous = self[previousIndex]
+                let next = nextIndex < endIndex ? self[nextIndex] : nil
+                if previous.isUppercase && next?.isLowercase == true {
+                    // Previous word was an initialism, and this uppercase letter starts a new word
+                    // containing the next character.
+                    pieces.append(currentPiece)
+                    currentPiece = String(character)
+                } else if previous.isUppercase {
+                    // Continue the initialism.
                     currentPiece.append(character)
                 } else {
+                    // Previous word was not an initialism, start a new word.
                     pieces.append(currentPiece)
                     currentPiece = character.uppercased()
                 }
@@ -30,7 +41,7 @@ extension String {
             }
         }
 
-        // Commit the last bit of the phrase
+        // Commit the last bit of the phrase.
         if !currentPiece.isEmpty {
             pieces.append(currentPiece)
         }

Tests/SpicesTests/CamelCaseToNaturalTextTests.swift

@@ -15,6 +15,7 @@ struct CamelCaseToNaturalTextTests {
         #expect("featureFlags".camelCaseToNaturalText() == "Feature Flags")
         #expect("notifications".camelCaseToNaturalText() == "Notifications")
         #expect("fastRefreshWidgets".camelCaseToNaturalText() == "Fast Refresh Widgets")
+        #expect("ignoreNextHTTPRequest".camelCaseToNaturalText() == "Ignore Next HTTP Request")
 
         // Suboptimal, but heuristics for these would be annoying.
         #expect("httpVersion".camelCaseToNaturalText() == "Http Version")