Returns the arity of this object.
For lua table length, see tableSize;
Implementation
int get length {
uses++;
return switch (type) {
LuaType.ref => deref().length,
LuaType.nil || LuaType.unresolved || LuaType.func => 0,
LuaType.table => _fields?.length ?? 0,
LuaType.value => 1,
};
}