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<?php $gmp = gmp_init(1); var_dump( $gmp, isset($gmp), $gmp ?? null, is_null($gmp), $gmp === null );
Output for git.master, git.master_jit, rfc.property-hooks
object(GMP)#1 (1) { ["num"]=> string(1) "1" } bool(true) object(GMP)#1 (1) { ["num"]=> string(1) "1" } bool(false) bool(false)

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