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<?php class Foo{} echo serialize([1, '2', [3,3,3], 4.0, new Foo]);
Output for git.master, git.master_jit, rfc.property-hooks
a:5:{i:0;i:1;i:1;s:1:"2";i:2;a:3:{i:0;i:3;i:1;i:3;i:2;i:3;}i:3;d:4;i:4;O:3:"Foo":0:{}}

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