JSONSerialization: Improve number parsing for JSON

- Add _NSJSONNumber, an internal subclass of NSNumber to provide lazy
  parsing of numbers at time of use. This avoids parsing numbers as
  Decimal when later bridged to Double/Float and vice-versa which
  has accuracy issues if converted from one to the other.

- Add test cases for SR-7054 and SR-12244

Author: spevans

Foundation.xcodeproj/project.pbxproj

@@ -397,11 +397,15 @@
 		B910957B1EEF237800A71930 /* NSString-UTF16-BE-data.txt in Resources */ = {isa = PBXBuildFile; fileRef = B91095791EEF237800A71930 /* NSString-UTF16-BE-data.txt */; };
 		B91161AA2429860900BD2907 /* DataURLProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B91161A82429857D00BD2907 /* DataURLProtocol.swift */; };
 		B91161AD242A363900BD2907 /* TestDataURLProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = B91161AB242A350D00BD2907 /* TestDataURLProtocol.swift */; };
+		B9292465258E75DD00E24DA5 /* NSJSONNumber.swift in Sources */ = {isa = PBXBuildFile; fileRef = B9292464258E75DD00E24DA5 /* NSJSONNumber.swift */; };
+		B929246F258E772B00E24DA5 /* CMakeLists.txt in Resources */ = {isa = PBXBuildFile; fileRef = B929246E258E772B00E24DA5 /* CMakeLists.txt */; };
 		B933A79E1F3055F700FE6846 /* NSString-UTF32-BE-data.txt in Resources */ = {isa = PBXBuildFile; fileRef = B933A79C1F3055F600FE6846 /* NSString-UTF32-BE-data.txt */; };
 		B933A79F1F3055F700FE6846 /* NSString-UTF32-LE-data.txt in Resources */ = {isa = PBXBuildFile; fileRef = B933A79D1F3055F600FE6846 /* NSString-UTF32-LE-data.txt */; };
 		B940492D223B146800FB4384 /* TestProgressFraction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B940492C223B146800FB4384 /* TestProgressFraction.swift */; };
 		B94B063C23FDE2BD00B244E8 /* SwiftFoundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 5B5D885D1BBC938800234F36 /* SwiftFoundation.framework */; };
 		B951B5EC1F4E2A2000D8B332 /* TestNSLock.swift in Sources */ = {isa = PBXBuildFile; fileRef = B951B5EB1F4E2A2000D8B332 /* TestNSLock.swift */; };
+		B959016E25970BE300CACAE3 /* TestNSJSONNumber.swift in Sources */ = {isa = PBXBuildFile; fileRef = B959016D25970BE300CACAE3 /* TestNSJSONNumber.swift */; };
+		B95901922597102000CACAE3 /* CMakeLists.txt in Resources */ = {isa = PBXBuildFile; fileRef = B95901912597102000CACAE3 /* CMakeLists.txt */; };
 		B95FC97622B84B0A005DEA0A /* TestNSSortDescriptor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 152EF3932283457B001E1269 /* TestNSSortDescriptor.swift */; };
 		B96C10F625BA1EFD00985A32 /* NSURLComponents.swift in Sources */ = {isa = PBXBuildFile; fileRef = B96C10F525BA1EFD00985A32 /* NSURLComponents.swift */; };
 		B96C110025BA20A600985A32 /* NSURLQueryItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = B96C10FF25BA20A600985A32 /* NSURLQueryItem.swift */; };
@@ -1107,10 +1111,14 @@
 		B91095791EEF237800A71930 /* NSString-UTF16-BE-data.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "NSString-UTF16-BE-data.txt"; sourceTree = "<group>"; };
 		B91161A82429857D00BD2907 /* DataURLProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DataURLProtocol.swift; sourceTree = "<group>"; };
 		B91161AB242A350D00BD2907 /* TestDataURLProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestDataURLProtocol.swift; sourceTree = "<group>"; };
+		B9292464258E75DD00E24DA5 /* NSJSONNumber.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NSJSONNumber.swift; sourceTree = "<group>"; };
+		B929246E258E772B00E24DA5 /* CMakeLists.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = CMakeLists.txt; sourceTree = "<group>"; };
 		B933A79C1F3055F600FE6846 /* NSString-UTF32-BE-data.txt */ = {isa = PBXFileReference; lastKnownFileType = text; path = "NSString-UTF32-BE-data.txt"; sourceTree = "<group>"; };
 		B933A79D1F3055F600FE6846 /* NSString-UTF32-LE-data.txt */ = {isa = PBXFileReference; lastKnownFileType = text; path = "NSString-UTF32-LE-data.txt"; sourceTree = "<group>"; };
 		B940492C223B146800FB4384 /* TestProgressFraction.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestProgressFraction.swift; sourceTree = "<group>"; };
 		B951B5EB1F4E2A2000D8B332 /* TestNSLock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestNSLock.swift; sourceTree = "<group>"; };
+		B959016D25970BE300CACAE3 /* TestNSJSONNumber.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestNSJSONNumber.swift; sourceTree = "<group>"; };
+		B95901912597102000CACAE3 /* CMakeLists.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = CMakeLists.txt; sourceTree = "<group>"; };
 		B95FC97222AF0050005DEA0A /* SwiftXCTest.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = SwiftXCTest.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		B95FC97422AF051B005DEA0A /* xcode-build.sh */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.sh; path = "xcode-build.sh"; sourceTree = "<group>"; };
 		B96C10F525BA1EFD00985A32 /* NSURLComponents.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NSURLComponents.swift; sourceTree = "<group>"; };
@@ -1775,6 +1783,7 @@
 		F023071023F0976B0023DBEC /* Foundation */ = {
 			isa = PBXGroup;
 			children = (
+				B95901912597102000CACAE3 /* CMakeLists.txt */,
 				155D3BBB22401D1100B0D38E /* FixtureValues.swift */,
 				616068F2225DE5C2004FCC54 /* FTPServer.swift */,
 				1520469A1D8AEABE00D02E36 /* HTTPServer.swift */,
@@ -1834,6 +1843,7 @@
 				EA66F63D1BF1619600136161 /* TestNSDictionary.swift */,
 				CD1C7F7C1E303B47008E331C /* TestNSError.swift */,
 				88D28DE61C13AE9000494606 /* TestNSGeometry.swift */,
+				B959016D25970BE300CACAE3 /* TestNSJSONNumber.swift */,
 				D3A597F11C33C68E00295652 /* TestNSKeyedArchiver.swift */,
 				D3A597EF1C33A9E500295652 /* TestNSKeyedUnarchiver.swift */,
 				61A395F91C2484490029B337 /* TestNSLocale.swift */,
@@ -2040,6 +2050,7 @@
 		F023072323F0A6E50023DBEC /* Foundation */ = {
 			isa = PBXGroup;
 			children = (
+				B929246E258E772B00E24DA5 /* CMakeLists.txt */,
 				F023072523F0B4890023DBEC /* Headers */,
 				F023072423F0B4140023DBEC /* Resources */,
 				EADE0B4D1BD09E0800C49C64 /* AffineTransform.swift */,
@@ -2097,6 +2108,7 @@
 				5BDC3FCD1BCF17D300ED97BB /* NSCFDictionary.swift */,
 				5BDC3FCF1BCF17E600ED97BB /* NSCFSet.swift */,
 				5BDC3FCB1BCF177E00ED97BB /* NSCFString.swift */,
+				15CA750924F8336A007DF6C1 /* NSCFTypeShims.swift */,
 				5BDC3F311BCC5DCB00ED97BB /* NSCharacterSet.swift */,
 				5BDC3F321BCC5DCB00ED97BB /* NSCoder.swift */,
 				EADE0B551BD15DFF00C49C64 /* NSComparisonPredicate.swift */,
@@ -2114,12 +2126,12 @@
 				EADE0B5F1BD15DFF00C49C64 /* NSGeometry.swift */,
 				EADE0B621BD15DFF00C49C64 /* NSIndexPath.swift */,
 				EADE0B631BD15DFF00C49C64 /* NSIndexSet.swift */,
+				B9292464258E75DD00E24DA5 /* NSJSONNumber.swift */,
 				EADE0B651BD15DFF00C49C64 /* NSKeyedArchiver.swift */,
 				EA418C251D57257D005EAD0D /* NSKeyedArchiverHelpers.swift */,
 				D3BCEB9F1C2F6DDB00295652 /* NSKeyedCoderOldStyleArray.swift */,
 				D39A14001C2D6E0A00295652 /* NSKeyedUnarchiver.swift */,
 				5BDC3F3B1BCC5DCB00ED97BB /* NSLocale.swift */,
-				15CA750924F8336A007DF6C1 /* NSCFTypeShims.swift */,
 				5BDC3F3C1BCC5DCB00ED97BB /* NSLock.swift */,
 				D3BCEB9D1C2EDED800295652 /* NSLog.swift */,
 				5BECBA391D1CAE9A00B39B1F /* NSMeasurement.swift */,
@@ -2710,6 +2722,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				B929246F258E772B00E24DA5 /* CMakeLists.txt in Resources */,
 				F023072623F0B4890023DBEC /* Headers in Resources */,
 				B983E32C23F0C69600D9C402 /* Docs in Resources */,
 				B983E32E23F0C6E200D9C402 /* CONTRIBUTING.md in Resources */,
@@ -2740,6 +2753,7 @@
 				D3A597F71C3415CC00295652 /* NSKeyedUnarchiver-ArrayTest.plist in Resources */,
 				CE19A88C1C23AA2300B4CB6A /* NSStringTestData.txt in Resources */,
 				E1A03F361C4828650023AF4D /* PropertyList-1.0.dtd in Resources */,
+				B95901922597102000CACAE3 /* CMakeLists.txt in Resources */,
 				E1A3726F1C31EBFB0023AF4D /* NSXMLDocumentTestData.xml in Resources */,
 				E1A03F381C482C730023AF4D /* NSXMLDTDTestData.xml in Resources */,
 				D3A598041C349E6A00295652 /* NSKeyedUnarchiver-OrderedSetTest.plist in Resources */,
@@ -2884,6 +2898,7 @@
 				5BF7AEC01BCD51F9008F214A /* NSUUID.swift in Sources */,
 				5BF7AEB01BCD51F9008F214A /* NSLocale.swift in Sources */,
 				EADE0BA31BD15E0000C49C64 /* NSKeyedArchiver.swift in Sources */,
+				B9292465258E75DD00E24DA5 /* NSJSONNumber.swift in Sources */,
 				5BF7AEAD1BCD51F9008F214A /* NSError.swift in Sources */,
 				EADE0BB61BD15E0000C49C64 /* NSSortDescriptor.swift in Sources */,
 				5BF7AEA41BCD51F9008F214A /* Bundle.swift in Sources */,
@@ -3100,6 +3115,7 @@
 				90E645DF1E4C89A400D0D47C /* TestNSCache.swift in Sources */,
 				5B13B34A1C582D4C00651CE2 /* TestURL.swift in Sources */,
 				EA54A6FB1DB16D53009E0809 /* TestObjCRuntime.swift in Sources */,
+				B959016E25970BE300CACAE3 /* TestNSJSONNumber.swift in Sources */,
 				BB3D7558208A1E500085CFDC /* Imports.swift in Sources */,
 				5B13B34D1C582D4C00651CE2 /* TestNSUUID.swift in Sources */,
 				15F10CDC218909BF00D88114 /* TestNSCalendar.swift in Sources */,

Sources/Foundation/CMakeLists.txt

@@ -72,6 +72,7 @@ add_library(Foundation
   NSGeometry.swift
   NSIndexPath.swift
   NSIndexSet.swift
+  NSJSONNumber.swift
   NSKeyedArchiver.swift
   NSKeyedArchiverHelpers.swift
   NSKeyedCoderOldStyleArray.swift