EntityWithQualityID - Runtime Docs

EntityWithQualityID :: union

An entity prototype with optional quality specification. Can be specified in one of four ways.

LuaEntity	The entity. Both prototype and quality of the entity will be used.
LuaEntityPrototype	The entity prototype. Normal quality will be used.
string	The prototype name. Normal quality will be used.
EntityIDAndQualityIDPair	A table of entity prototype and quality.