Argument factories should be using Class.isAssignableFrom, not instanceof

[qualidafial]

instanceof is always false for null, which means the argument factory misses a chance to provide the correct SQL type.

These factories should be using e.g. Foo.class.isAssignableFrom(expectedType) instead of value instanceof Foo:

• InstantArgumentFactory
• LocalDateArgumentFactory
• LocalDateTimeArgumentFactory
• OptionalArgumentFactory
• OptionalInstantArgumentFactory
• OptionalLocalDateArgumentFactory
• OptionalLocalDateTimeArgumentFactory

Although the optional ones are arguably moot, since one should never pass null to a method that expects an optional.