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<?php var_dump(serialize((float)214748364899999999));
based on Z1BYi
Output for 5.6.28, 7.0.20 - 7.2.0
string(18) "d:2.147483649E+17;"
Output for 5.3.19 - 5.6.21, 7.0.0 - 7.0.6
string(21) "d:214748364900000000;"