Change default from null to Validator::ERROR_ALL

No functional changes, this is just a better hint to the user for what
the default case actually is.

Author: erayd

src/JsonSchema/Constraints/BaseConstraint.php

@@ -77,9 +77,9 @@ public function addErrors(array $errors)
         }
     }
 
-    public function getErrors($errorContext = null)
+    public function getErrors($errorContext = Validator::ERROR_ALL)
     {
-        if ($errorContext === null) {
+        if ($errorContext === Validator::ERROR_ALL) {
             return $this->errors;
         }
 
@@ -90,9 +90,9 @@ public function getErrors($errorContext = null)
         });
     }
 
-    public function numErrors($errorContext = null)
+    public function numErrors($errorContext = Validator::ERROR_ALL)
     {
-        if ($errorContext === null) {
+        if ($errorContext === Validator::ERROR_ALL) {
             return count($this->errors);
         }
 

src/JsonSchema/Validator.php

@@ -26,6 +26,7 @@ class Validator extends BaseConstraint
     const SCHEMA_MEDIA_TYPE = 'application/schema+json';
 
     const ERROR_NONE                    = 0x00000000;
+    const ERROR_ALL                     = ~self::ERROR_NONE;
     const ERROR_DOCUMENT_VALIDATION     = 0x00000001;
     const ERROR_SCHEMA_VALIDATION       = 0x00000002;