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<?php var_dump(2**62); var_dump((string) 2**63); var_dump(sprintf('%d', 2**63)); var_dump(sprintf('%ld', 2**63));
Output for git.master, git.master_jit, rfc.property-hooks
int(4611686018427387904) string(19) "9.2233720368548E+18" string(20) "-9223372036854775808" string(20) "-9223372036854775808"

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