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<?php function my_length1(string $a): int { $a[0] = 'f'; var_dump(memory_get_peak_usage()); return strlen($a); } $a = str_repeat("a", 100_000); var_dump(memory_get_peak_usage()); my_length1($a);

This is an error 500

Value for `_results` contains invalid data `array`


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