* only the entries for {@code keys} will be returned from {@code getAll}.
   *
   * <p>This method should be overridden when bulk retrieval is significantly more efficient than
   * many individual lookups. Note that {@link LoadingCache#getAll} will defer to individual calls
   * to {@link LoadingCache#get} if this method is not overridden.
   *
   * @param keys the unique, non-null keys whose values should be loaded

/// tip | Порада

// LTYPEX spec9	{ outcode($1, &$2); }
	PINSRW	$4, AX, X2
	PINSRW	$4, foo+4(SB), X2

// LTYPERT spec10	{ outcode($1, &$2); }
	JCS	2(PC)
	RETFL	$4

// Was bug: LOOP is a branch instruction.
	JCS	2(PC)
loop:
	LOOP	loop // LOOP

	// Intel pseudonyms for our own renamings.
	PADDD	M2, M1 // PADDL M2, M1
	MOVDQ2Q	X1, M1 // MOVQ X1, M1
	MOVNTDQ	X1, (AX)	// MOVNTO X1, (AX)
	MOVOA	(AX), X1	// MOVO (AX), X1

   * remove()}. Otherwise, all optional operations are supported. Null row keys, columns keys, and
   * values are not supported.
   *
   * <p>Lookups by row key are often faster than lookups by column key, because the data is stored
   * in a {@code Map<R, Map<C, V>>}. A method call like {@code column(columnKey).get(rowKey)} still

		// be extra careful: Scanner is for safe, simple jobs.
		for loop := 0; ; {
			n, err := s.r.Read(s.buf[s.end:len(s.buf)])
			if n < 0 || len(s.buf)-s.end < n {
				s.setErr(ErrBadReadCount)
				break
			}
			s.end += n
			if err != nil {
				s.setErr(err)
				break
			}
			if n > 0 {
				s.empties = 0
				break
			}
			loop++
			if loop > maxConsecutiveEmptyReads {
				s.setErr(io.ErrNoProgress)

/// tip | Tipp

Wenn Sie einen `RuntimeError: Task attached to a different loop` erhalten, wenn Sie asynchrone Funktionsaufrufe in Ihre Tests integrieren (z. B. bei Verwendung von [MongoDBs MotorClient](https://stackoverflow.com/questions/41584243/runtimeerror-task-attached-to-a-different-loop)), dann denken Sie daran, Objekte zu instanziieren, die einen Event Loop nur innerhalb asynchroner Funktionen benötigen, z. B. einen `@app.on_event("startup")`-Callback.

	v := MSS{"abc": "def", "ghi": "jkl"}
	b.ReportAllocs()

	for b.Loop() {
		v.MarshalMsg(nil)
	}
}

func BenchmarkAppendMsgMSS(b *testing.B) {
	v := MSS{"abc": "def", "ghi": "jkl"}
	bts := make([]byte, 0, v.Msgsize())
	bts, _ = v.MarshalMsg(bts[0:0])
	b.SetBytes(int64(len(bts)))
	b.ReportAllocs()

	for b.Loop() {
		bts, _ = v.MarshalMsg(bts[0:0])
	}
}

As seen in [Return a Response directly](response-directly.md), you can also override the response directly in your *path operation*, by returning it.

The same example from above, returning an `HTMLResponse`, could look like:

{* ../../docs_src/custom_response/tutorial003_py310.py hl[2,7,19] *}

/// warning

    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    GWT happens to use the prod .gwt.xml, so it looks for no supersource for
    tests, either. This causes it to fail to find AtomicLongMapTest.

    Our workaround is to tell GWT that util.concurrent and all other packages

        return prp.setProperty(key, value);
    }

    /**
     * Retrieve a property as an <code>Object</code>.
     *
     * @param key the property key to look up
     * @return the property value as an Object, or null if not found
     */

    public static Object get(final String key) {
        return prp.get(key);
    }

    /**