Changes the reader to treat the next name as a string value. This is useful for map adapters so that arbitrary type adapters can use nextString to read a name value.
{@code * JsonReader reader = JsonReader.of(new Buffer().writeUtf8("{\"a\":\"b\"}")); * reader.beginObject(); * reader.promoteNameToValue(); * assertEquals("a", reader.nextString()); * assertEquals("b", reader.nextString()); * reader.endObject(); * }