Why does Java not support accessing primitive return values when invoking methods without boxing via reflection?

I noticed that Java Reflection supports access on fields of primitive types such as boolean or int without boxing:

public final class Field extends AccessibleObject implements Member {
    //...
    public boolean getBoolean(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public char getChar(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public byte getByte(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public short getShort(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public int getInt(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public long getLong(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public float getFloat(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    public double getDouble(Object obj) throws IllegalArgumentException, IllegalAccessException { ... }
    //...
}

However, there is only invoke(...) for methods which always returns Object. This forces boxing when it is used with methods with primitive return values. I wonder why there is no support for that yet. Has it not been asked for or are there serious issues which prevent it?