Upgrade to 3.5.2
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@@ -597,7 +597,7 @@ class A
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*/
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public static function isAssociative(array $array): bool
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{
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return ctype_digit(implode(null, array_keys($array))) === false;
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return ctype_digit(implode('', array_keys($array))) === false;
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}
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/**
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