brouilleursdeblanc/_sass/vendor/bourbon/helpers/_is-num.scss

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//************************************************************************//
// Helper for linear-gradient-parser
//************************************************************************//
@function _is-num($char) {
$values: '0' '1' '2' '3' '4' '5' '6' '7' '8' '9' 0 1 2 3 4 5 6 7 8 9;
$index: index($values, $char);
@return if($index, true, false);
}