Properly handle upcasting of numbers into BigInteger (#1074).

Author: cincuranet

src/FirebirdSql.Data.FirebirdClient.Tests/FbInt128SupportTests.cs

@@ -85,6 +85,15 @@ public async Task PassesValueCorrectly(BigInteger value)
 		}
 	}
 
+	[Test]
+	public Task CanPassAsByte() => CanPassAsTypeHelper<byte>(6);
+	[Test]
+	public Task CanPassAsInt16() => CanPassAsTypeHelper<short>(6);
+	[Test]
+	public Task CanPassAsInt32() => CanPassAsTypeHelper<int>(6);
+	[Test]
+	public Task CanPassAsInt64() => CanPassAsTypeHelper<long>(6);
+
 	[Test]
 	public async Task ReadsValueNullCorrectly()
 	{
@@ -149,4 +158,14 @@ async Task CanReadAsTypeHelper<T>(T value, Func<FbDataReader, T> getter)
 			}
 		}
 	}
+
+	async Task CanPassAsTypeHelper<T>(T value)
+	{
+		await using (var cmd = Connection.CreateCommand())
+		{
+			cmd.CommandText = "select cast(@value as int128) from rdb$database";
+			cmd.Parameters.AddWithValue("value", value);
+			Assert.DoesNotThrowAsync(cmd.ExecuteScalarAsync);
+		}
+	}
 }

src/FirebirdSql.Data.FirebirdClient/Common/DbValue.cs

@@ -265,7 +265,14 @@ public FbDecFloat GetDecFloat()
 
 	public BigInteger GetInt128()
 	{
-		return (BigInteger)_value;
+		return _value switch
+		{
+			byte b => b,
+			short s => s,
+			int i => i,
+			long l => l,
+			_ => (BigInteger)_value,
+		};
 	}
 
 	public FbZonedDateTime GetZonedDateTime()