Test: /ext/session/tests/session_encode_variation3.phpt - Version 7.2.20    

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1 (100%)
003+ string(46) "a:1:{s:3:"foo";a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}}"
003- string(34) "foo|a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}"