David Luzar 9439908b92
use a better cloning algorithm (#753)
* use a better cloning algorithm

* Revert "use a better cloning algorithm"

This reverts commit 7279262129d665ffa92f016802155c1db7c35b7f.

* implement custom cloning algorithm

* add tests

* refactor

* don't copy canvas & ignore canvas in related ops

* fix tests
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