public function resolve( $abstract, array $parameters = [] ) {

		// Get the true abstract name.
		$abstract = $this->getAbstract( $abstract );

		// If this is being managed as an instance and we already have
		// the instance, return it now.
		if ( isset( $this->instances[ $abstract ] ) ) {

			return $this->instances[ $abstract ];
		}

		// Get the concrete implementation.
		$concrete = $this->getConcrete( $abstract );

		// If we can't build an object, assume we should return the value.
		if ( ! $this->isBuildable( $concrete ) ) {

			// If we don't actually have this, return false.
			if ( ! $this->has( $abstract ) ) {
				return false;
			}

			return $concrete;
		}

		// Build the object.
		$object = $this->build( $concrete, $parameters );

		if ( ! $this->has( $abstract ) ) {
			return $object;
		}

		// If shared instance, make sure to store it in the instances
		// array so that we're not creating new objects later.
		if ( $this->bindings[ $abstract ]['shared'] && ! isset( $this->instances[ $abstract ] ) ) {

			$this->instances[ $abstract ] = $object;
		}

		// Run through each of the extensions for the object.
		foreach ( $this->extensions[ $abstract ] as $extension ) {

			$object = new $extension( $object, $this );
		}

		// Return the object.
		return $object;
	}