Support for type coercion for values passed as ids and as query parameter bindings

- widening coercions
- valid (no over/under flow) narrowing coercions
- JpaCompliance setting

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/BigDecimalTypeDescriptor.java

@@ -107,6 +107,10 @@ public class BigDecimalTypeDescriptor extends AbstractClassTypeDescriptor<BigDec
 			return null;
 		}
 
+		if ( value instanceof BigDecimal ) {
+			return (BigDecimal) value;
+		}
+
 		if ( value instanceof Number ) {
 			return BigDecimal.valueOf( ( (Number) value ).doubleValue() );
 		}