Document the MySQL bug affecting "IsLong".

Author: bgrainger

docs/content/tutorials/migrating-from-connector-net.md

@@ -94,3 +94,4 @@ property doesn't reference the active transaction. See [#333](https://github.com
 * [#85185](https://bugs.mysql.com/bug.php?id=85185): `ConnectionReset=True` does not preserve connection charset
 * [#86263](https://bugs.mysql.com/bug.php?id=86263): Transaction isolation level affects all transactions in session
 * [#87868](https://bugs.mysql.com/bug.php?id=87868): `ColumnSize` in schema table is incorrect for `CHAR(36)` and `BLOB` columns
+* [#87876](https://bugs.mysql.com/bug.php?id=87876): `IsLong` is schema table is incorrect for `LONGTEXT` and `LONGBLOB` columns

tests/SideBySide/DataTypes.cs

@@ -675,13 +675,14 @@ public void GetSchemaTable(string column, string table, int columnSize, Type dat
 					Assert.Equal(ordinal, schema["ColumnOrdinal"]);
 					Assert.Equal(dataType, schema["DataType"]);
 #if BASELINE
-					// https://bugs.mysql.com/bug.php?id=87868
+					// https://bugs.mysql.com/bug.php?id=87868, https://bugs.mysql.com/bug.php?id=87876
 					if (!column.EndsWith("blob", StringComparison.OrdinalIgnoreCase) && column != "text" && dataType != typeof(Guid) && columnSize != int.MaxValue)
 						Assert.Equal(columnSize, schema["ColumnSize"]);
 #else
 					Assert.Equal(columnSize, schema["ColumnSize"]);
 #endif
 #if BASELINE
+					// https://bugs.mysql.com/bug.php?id=87876
 					Assert.Equal(isLong && columnSize != int.MaxValue, schema["IsLong"]);
 #else
 					Assert.Equal(isLong, schema["IsLong"]);