Enforce string type for string operations

split: b40122acb6c4acafd4e04ff3cef4f202876eb2cb

Author: kylekatarnls

Reader.php

@@ -323,7 +323,7 @@ public function peek($length = null, $start = null)
      */
     public function match($pattern, $modifiers = null, $ignoredSuffixes = null)
     {
-        $modifiers = $modifiers ?: '';
+        $modifiers = (string) $modifiers;
         $ignoredSuffixes = $ignoredSuffixes ?: "\n";
         $matches = null;
         $this->lastMatchResult = null;
@@ -572,7 +572,7 @@ public function peekQuote()
      */
     public function peekSpace()
     {
-        return ctype_space($this->peek());
+        return ctype_space((string) $this->peek());
     }
 
     /**
@@ -584,7 +584,7 @@ public function peekSpace()
      */
     public function peekDigit()
     {
-        return ctype_digit($this->peek());
+        return ctype_digit((string) $this->peek());
     }
 
     /**
@@ -596,7 +596,7 @@ public function peekDigit()
      */
     public function peekAlpha()
     {
-        return ctype_alpha($this->peek());
+        return ctype_alpha((string) $this->peek());
     }
 
     /**
@@ -608,7 +608,7 @@ public function peekAlpha()
      */
     public function peekAlphaNumeric()
     {
-        return ctype_alnum($this->peek());
+        return ctype_alnum((string) $this->peek());
     }
 
     /**
@@ -658,7 +658,7 @@ public function readIndentation()
      */
     public function readUntilNewLine()
     {
-        return $this->readUntil([$this, 'peekNewLine']);
+        return (string) $this->readUntil([$this, 'peekNewLine']);
     }
 
     /**