improvement: fix issue 1968 and correct visitor pattern code and test. (#2023)
* fix issue 1968 and correct visitor pattern code and test. * fix README code as well.
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xyllq999 committed
a568656036a135492bfe35ba767b77e52e9d3019
Parent: b33d002
Committed by GitHub <noreply@github.com>
on 9/25/2022, 6:02:08 PM