Optimize remaining equality checks using pattern matching

src/ImageSharp/ColorSpaces/CieLab.cs

@@ -194,12 +194,7 @@ namespace SixLabors.ImageSharp.ColorSpaces
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public override bool Equals(object obj)
         {
-            if (obj is CieLab)
-            {
-                return this.Equals((CieLab)obj);
-            }
-
-            return false;
+            return obj is CieLab other && this.Equals(other);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccChromaticityTagDataEntry.cs

@@ -104,7 +104,7 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Icc
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            return obj is IccChromaticityTagDataEntry && this.Equals((IccChromaticityTagDataEntry)obj);
+            return obj is IccChromaticityTagDataEntry other && this.Equals(other);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccDateTimeTagDataEntry.cs

@@ -60,7 +60,7 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Icc
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            return obj is IccDateTimeTagDataEntry && this.Equals((IccDateTimeTagDataEntry)obj);
+            return obj is IccDateTimeTagDataEntry other && this.Equals(other);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccResponseCurveSet16TagDataEntry.cs

@@ -77,17 +77,7 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Icc
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            if (obj is null)
-            {
-                return false;
-            }
-
-            if (ReferenceEquals(this, obj))
-            {
-                return true;
-            }
-
-            return obj is IccResponseCurveSet16TagDataEntry && this.Equals((IccResponseCurveSet16TagDataEntry)obj);
+            return obj is IccResponseCurveSet16TagDataEntry other && this.Equals(other);
         }
 
         /// <inheritdoc />

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccViewingConditionsTagDataEntry.cs

@@ -80,7 +80,7 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Icc
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            return obj is IccViewingConditionsTagDataEntry && this.Equals((IccViewingConditionsTagDataEntry)obj);
+            return obj is IccViewingConditionsTagDataEntry other && this.Equals(other);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/Various/IccScreeningChannel.cs

@@ -77,7 +77,7 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Icc
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            return obj is IccScreeningChannel && this.Equals((IccScreeningChannel)obj);
+            return obj is IccScreeningChannel other && this.Equals(other);
         }
 
         /// <inheritdoc/>

src/ImageSharp/PixelFormats/Bgr565.cs

@@ -206,7 +206,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is Bgr565) && this.Equals((Bgr565)obj);
+            return obj is Bgr565 other && this.Equals(other);
         }
 
         /// <inheritdoc />

src/ImageSharp/PixelFormats/HalfSingle.cs

@@ -211,7 +211,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is HalfSingle) && this.Equals((HalfSingle)obj);
+            return obj is HalfSingle other && this.Equals(other);
         }
 
         /// <inheritdoc />

src/ImageSharp/PixelFormats/HalfVector2.cs

@@ -239,7 +239,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is HalfVector2) && this.Equals((HalfVector2)obj);
+            return obj is HalfVector2 other && this.Equals(other);
         }
 
         /// <inheritdoc />

src/ImageSharp/PixelFormats/NormalizedShort2.cs

@@ -247,7 +247,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is NormalizedShort2) && this.Equals((NormalizedShort2)obj);
+            return obj is NormalizedShort2 other && this.Equals(other);
         }
 
         /// <inheritdoc />

src/ImageSharp/PixelFormats/Rg32.cs

@@ -210,7 +210,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is Rg32) && this.Equals((Rg32)obj);
+            return obj is Rg32 other && this.Equals(other);
         }
 
         /// <inheritdoc />

tests/ImageSharp.Tests/Memory/BufferTestSuite.cs

@@ -46,8 +46,7 @@ namespace SixLabors.ImageSharp.Tests.Memory
 
             public override bool Equals(object obj)
             {
-                if (ReferenceEquals(null, obj)) return false;
-                return obj is CustomStruct && this.Equals((CustomStruct)obj);
+                return obj is CustomStruct other && this.Equals(other);
             }
 
             public override int GetHashCode()