Update the double/float formatters to return the shortest roundtrippable string. (#22040)

* Updating Number.Formatting to always compute a round-trippable number by default.

* Adding a third-party notice entry for the Grisu3 reference implementation

* Fixing up the Grisu3 algorithm to better match the reference implementation (including comments, etc)

* Porting the Grisu3 implementation that generates the shortest roundtrippable sequence.

* Updating the Dragon4 algorithm to support printing the shortest roundtrippable string.

* Fixing the double/float formatters to ignore precision specifiers for 'R'

* Fixing the double/float formatters to handle +0.0 and -0.0

* Fix the casing of `point` in THIRD-PARTY-NOTICES

Co-Authored-By: tannergooding <tagoo@outlook.com>

* Fixing the double/float formatting code to consider a precision specifier of 0 to be the same as default.

* Fixing the double/float formatter so that nMaxDigits is set appropriately.

* Changing the double/float formatting logic to account for the format when determining the correct precision to request.

* Updating the double/float formatter to take the format specifier into account when determining the number of digits to request.

* Fixing the double/float formatting code to continue handling zero correctly.

* Disabling some outdated CoreFX tests.

* Responding to various feedback from the PR

1 files changed, 33 insertions, 1 deletions

diff --git a/THIRD-PARTY-NOTICES.TXT b/THIRD-PARTY-NOTICES.TXT
index 4a8002db25..831105f181 100644
--- a/THIRD-PARTY-NOTICES.TXT
+++ b/THIRD-PARTY-NOTICES.TXT
@@ -197,7 +197,9 @@ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-License notice for the Printing Floating-Point Numbers 
+License notice for Printing Floating-Point Numbers (Dragon4)
+------------------------------------------------------------
+
 /******************************************************************************
   Copyright (c) 2014 Ryan Juckett
   http://www.ryanjuckett.com/
@@ -222,6 +224,36 @@ License notice for the Printing Floating-Point Numbers
      distribution.
 ******************************************************************************/
 
+License notice for Printing Floating-point Numbers (Grisu3)
+-----------------------------------------------------------
+
+Copyright 2012 the V8 project authors. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 License notice for xxHash
 -------------------------