System.Globalization.HebrewNumber.IsDigit C# (CSharp) Method

        internal static bool IsDigit(char ch) {
            if (ch >= minHebrewNumberCh && ch <= maxHebrewNumberCh) {
                return (HebrewValues[ch - minHebrewNumberCh].value >= 0);
            }
            return (ch == '\'' || ch == '\"');
        }