code: public function has(string $typeName): bool
      {
          if (isset($this->shared[$typeName]) || isset($this->definitions[$typeName])) {
              return true;
          }
          
          if (!isset($this->typeCache[$typeName])) {
              if (\class_exists($typeName) || \interface_exists($typeName, false)) {
                  $this->typeCache[$typeName] = new \ReflectionClass($typeName);
              } else {
                  $this->typeCache[$typeName] = false;
              }
          }
          
          return $this->typeCache[$typeName] !== false && $this->typeCache[$typeName]->isInstantiable();
      }
docs: Check if an instance or a binding is registered for the given type.
  
  Will attempt to load the given type and check if it is instantiable if no explicit binding is configured.