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<?php $a = new GMP(1); var_dump($a); $a += 1; var_dump($a);
Output for git.master, git.master_jit
object(GMP)#1 (1) { ["num"]=> string(1) "0" } object(GMP)#2 (1) { ["num"]=> string(1) "1" }
Output for rfc.property-hooks
object(GMP)#1 (1) { ["num"]=> string(1) "1" } object(GMP)#2 (1) { ["num"]=> string(1) "2" }

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