Refactor: Extract string cast overloading to base class

Author: thekid

src/main/php/math/BigFloat.class.php

@@ -114,13 +114,4 @@ public function round($precision= 0) {
       : ('-' === $this->num{0} ? bcsub($this->num, $a, $precision) : bcadd($this->num, $a, $precision))
     );
   }
-
-  /**
-   * String cast overloading
-   *
-   * @return  string
-   */
-  public function __toString() {
-    return $this->num;
-  }
 }

src/main/php/math/BigInt.class.php

@@ -286,15 +286,6 @@ protected static function bytesOf($n) {
     }
     return ltrim($value, "\0");    
   }
-  
-  /**
-   * String cast overloading
-   *
-   * @return  string
-   */
-  public function __toString() {
-    return $this->num;
-  }
 
   /**
    * Returns an byte representing this big integer

src/main/php/math/BigNum.class.php

@@ -68,11 +68,14 @@ public function intValue() { return (int)substr($this->num, 0, strcspn($this->nu
    */
   public function doubleValue() { return (double)$this->num; }
 
+  /** @return string */
+  public function __toString() { return $this->num; }
+
   /** @return string */
   public function toString() { return nameof($this).'('.$this->num.')'; }
 
   /** @return string */
-  public function hashCode() { return $this->num; }
+  public function hashCode() { return (string)$this->num; }
 
   /**
    * Compare another value to this bignum