Possible bug in DoubleParser.cs

[lopango]

In Microsoft.ML.Core\Utilities\DoubleParser.cs near lines 143 and 195

            int ichEnd;
            if (!DoubleParser.TryParse(span.Slice(ich, span.Length - ich), out value, out ichEnd, flags))
            {
                value = default(Double);
                return Result.Error;
            }

            // Make sure everything was consumed.
            while (ichEnd < span.Length)
            {
                if (!char.IsWhiteSpace(span[ichEnd]))
                    return Result.Extra;
                ichEnd++;
            }

the ichEnd is indexed on the sliced span.
If ich is not 0 there will be an offset when for "ichEnd < span.Length" and "span[ichEnd]"

Example : for an input like " 1.234 " the method will return Result.Extra

Pössible solutions:

• ichEnd += ich;
• modify the tryparse to accept an offset and use the original span