v0.4.2

• New: Spell#orWhere() and Spell#orHaving()
• New: arithmetic operators
• New: unary operators such as unary minus - and bit invertion ~
• Fix: unset attribute should be overwritable
• Fix: attributeChanged() should be false if attribute is unset and not overwritten
• Fix: subclass with incomplete getter/setter should be complemented
• Fix: sharding key validation on Bone.update() and Bone.save()
• Fix: sharding key should be along with primary key on bone.remove()
• Fix: Bone.cast() should leave null as is
• Fix: INSERT ... UPDATE with id = LAST_INSERT_ID(id) in MySQL
• Fix: Model.find({ name: { $op1, $op2 } }) object conditions with multiple operators
• Fix: prefixing result set with qualifiers if query contains join relations and is not dispatchable
• Fix: Spell#$get(index) with LIMIT
• Docs: Model.transaction()
• Docs: definition types with index.d.ts