Some synthatic sugar

Author: onizet

src/Html2OpenXml/Primitives/HtmlBorder.cs

@@ -73,7 +73,7 @@ public SideBorder Right
     /// <summary>
     /// Gets whether at least one side has been specified.
     /// </summary>
-    public bool IsEmpty
+    public readonly bool IsEmpty
     {
         get => sides == null || !(Left.IsValid || Right.IsValid || Bottom.IsValid || Top.IsValid);
     }

src/Html2OpenXml/Primitives/HtmlColor.cs

@@ -17,7 +17,7 @@ namespace HtmlToOpenXml;
 /// <summary>
 /// Represents an ARGB color.
 /// </summary>
-readonly struct HtmlColor
+readonly struct HtmlColor : IEquatable<HtmlColor>
 {
     private static readonly char[] hexDigits = {
         '0', '1', '2', '3', '4', '5', '6', '7',

src/Html2OpenXml/Primitives/Unit.cs

@@ -88,7 +88,7 @@ public static Unit Parse(string? str, UnitMetric defaultMetric = UnitMetric.Unit
     /// <summary>
     /// Gets the value expressed in the English Metrics Units.
     /// </summary>
-    private static Int64 ComputeInEmus(UnitMetric type, double value)
+    private static long ComputeInEmus(UnitMetric type, double value)
     {
         /* Compute width and height in English Metrics Units.
             * There are 360000 EMUs per centimeter, 914400 EMUs per inch, 12700 EMUs per point