Reduce complexity to acceptable levels

src/BaseConverter.php

@@ -92,7 +92,7 @@ public function convert ($number)
         $fractions = '';
         $sign = '';
 
-        if (isset($integer[0]) && in_array($integer[0], ['+', '-'])) {
+        if (in_array(substr($integer, 0, 1), ['+', '-'], true)) {
             $sign = $integer[0];
             $integer = substr($integer, 1);
         }

src/DecimalConverter.php

@@ -61,8 +61,7 @@ public function convertFractions(array $number)
         $target = gmp_init($this->target->getRadix());
         $dividend = $this->toDecimal($this->source->getValues($number));
         $divisor = $this->toDecimal([1] + array_fill(1, max(count($number), 1), 0));
-        $digits = $this->precision > 0
-            ? $this->precision : $this->countDigits(count($number)) + abs($this->precision);
+        $digits = $this->getFractionDigitCount(count($number));
         $zero = gmp_init('0');
         $result = [];
 
@@ -124,8 +123,12 @@ private function toBase($decimal)
      * @param integer $count Number of digits in the original number
      * @return integer Number of digits required in the target base
      */
-    private function countDigits($count)
+    private function getFractionDigitCount($count)
     {
+        if ($this->precision > 0) {
+            return $this->precision;
+        }
+
         $target = gmp_init($this->target->getRadix());
         $maxFraction = gmp_pow(gmp_init($this->source->getRadix()), $count);
         $digits = 1;
@@ -134,6 +137,6 @@ private function countDigits($count)
             $digits++;
         }
 
-        return $digits;
+        return $digits + abs($this->precision);
     }
 }