Made floating point numbers conform to CustomDebugStringConvertible

debugDescription prints numbers with greater precision

Author: wokalski

stdlib/public/core/FloatingPoint.swift.gyb

@@ -198,7 +198,14 @@ public struct ${Self} {
 extension ${Self} : CustomStringConvertible {
   /// A textual representation of `self`.
   public var description: String {
-    return _float${bits}ToString(self)
+    return _float${bits}ToString(self, debug: false)
+  }
+}
+
+extension ${Self} : CustomDebugStringConvertible {
+  /// A textual representation of `self`.
+  public var debugDescription: String {
+    return _float${bits}ToString(self, debug: true)
   }
 }
 

stdlib/public/stubs/Stubs.cpp

@@ -141,7 +141,8 @@ static int swift_snprintf_l(char *Str, size_t StrSize, locale_t Locale,
 
 template <typename T>
 static uint64_t swift_floatingPointToString(char *Buffer, size_t BufferLength,
-                                            T Value, const char *Format, bool Debug) {
+                                            T Value, const char *Format, 
+                                            bool Debug) {
   if (BufferLength < 32)
     swift::crash("swift_floatingPointToString: insufficient buffer size");