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Numeric#magnitude

static VALUE
num_abs(VALUE num)
{
    if (rb_num_negative_int_p(num)) {
        return num_funcall0(num, idUMinus);
    }
    return num;
}

Alias of #abs

12.abs         #=> 12
(-34.56).abs   #=> 34.56
-34.56.abs     #=> 34.56