use pre-context to finalize if ctx is nil

Signed-off-by: Kevin Chen <[email protected]>

fix asObjectField()

Signed-off-by: Kevin Chen <[email protected]>

fix pointer reciever's serialize()

Signed-off-by: Kevin Chen <[email protected]>

add selection test file

fix recursive referrence error

Signed-off-by: Kevin Chen <[email protected]>

fix subscription bugs

fix isBaseType()

Update README.md

first tag for internal test only