Updating NumberToFloatingPointBitsSlow to handle the remaining parsed fractional...

Commit migrated from https://github.com/dotnet/coreclr/commit/460b97aa406f10cf9ab19e6398e1e1a72fc58b48

diff --git a/src/libraries/System.Private.CoreLib/src/System/Number.NumberToFloatingPointBits.cs b/src/libraries/System.Private.CoreLib/src/System/Number.NumberToFloatingPointBits.cs
index 3443622..98ad9f2 100644 (file)
--- a/src/libraries/System.Private.CoreLib/src/System/Number.NumberToFloatingPointBits.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Number.NumberToFloatingPointBits.cs
@@ -484,7 +484,16 @@ namespace System
             }
 
             AccumulateDecimalDigitsIntoBigInteger(ref number, fractionalFirstIndex, fractionalLastIndex, out BigInteger fractionalNumerator);
-            Debug.Assert(!fractionalNumerator.IsZero());
+
+            if (fractionalNumerator.IsZero())
+            {
+                return ConvertBigIntegerToFloatingPointBits(
+                    ref integerValue,
+                    in info,
+                    integerBitsOfPrecision,
+                    fractionalDigitsPresent != 0
+                );
+            }
 
             BigInteger.Pow10(fractionalDenominatorExponent, out BigInteger fractionalDenominator);