Don't overgrow buffer

Author: linkdotnet

src/LinkDotNet.StringBuilder/ValueStringBuilder.Append.cs

@@ -15,7 +15,7 @@ public void Append(bool value)
         // So we can check if we have enough space in the buffer
         if (bufferPosition + 5 > buffer.Length)
         {
-            Grow(bufferPosition * 2);
+            Grow(bufferPosition);
         }
 
         if (!value.TryFormat(buffer[bufferPosition..], out var charsWritten))
@@ -48,7 +48,7 @@ public void Append(scoped ReadOnlySpan<char> str)
         var newSize = str.Length + bufferPosition;
         if (newSize > buffer.Length)
         {
-            Grow(newSize * 2);
+            Grow(newSize);
         }
 
         str.CopyTo(buffer[bufferPosition..]);

src/LinkDotNet.StringBuilder/ValueStringBuilder.Insert.cs

@@ -45,7 +45,7 @@ public void Insert(int index, scoped ReadOnlySpan<char> value)
         var newLength = bufferPosition + value.Length;
         if (newLength > buffer.Length)
         {
-            Grow(newLength * 2);
+            Grow(newLength);
         }
 
         bufferPosition = newLength;
@@ -79,7 +79,7 @@ private void InsertSpanFormattable<T>(int index, T value, ReadOnlySpan<char> for
             var newLength = bufferPosition + written;
             if (newLength > buffer.Length)
             {
-                Grow(newLength * 2);
+                Grow(newLength);
             }
 
             bufferPosition = newLength;