Description:
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From manual page: http://www.php.net/function.range
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Test script:
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$allowedChars_num = range(0,9);
$allowedChars_str = range('0','9');
var_dump($allowedChars_num);
var_dump($allowedChars_str);

Expected result:
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range(0,9) is proper, making an array of integers
range('0','9') should be making an array of strings, ex: '0','1','2' etc...

Actual result:
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array(10) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) [6]=> int(6) [7]=> int(7) [8]=> int(8) [9]=> int(9) } 

array(10) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) [6]=> int(6) [7]=> int(7) [8]=> int(8) [9]=> int(9) }