void addEncoded(byte b) {
            if (encoded == null) {
                encoded = new BitSet();
            }
            encoded.set(length);
            data[length++] = b;
            numEncodedBytes++;
        }
Marks this {@link RequestTarget} as stored in {@link RequestTargetCache} so that it doesn't
try to store again.
core/src/main/java/com/linecorp/armeria/internal/common/DefaultRequestTarget.java