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<?php var_dump([99.11 => '99']);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Implicit conversion from float 99.11 to int loses precision in /in/bAiUD on line 3 array(1) { [99]=> string(2) "99" }
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
array(1) { [99]=> string(2) "99" }

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