There are several native methods in ObjectInputStream and ObjectOutputStream:

    ObjectInputStream.bytesToFloats
    ObjectInputStream.bytesToDoubles
    ObjectOutputStream.floatsToBytes
    ObjectOutputStream.doublesToBytes

Each of these method has a comment of the following form near the native method declaration in the corresponding .java file:

    // REMIND: remove once hotspot inlines Float.intBitsToFloat

The methods

    Float.floatToIntBits
    Float.intBitsToFloat
    Double.doubleToLongBits
    Double.longBitsToDouble

are all annotated with @HotSpotIntrinsicCandidate so this might indicate that the "inlining" being awaited in the comment has been fulfilled. If so, the serialization native methods can be removed.