Correction at method parseVersion() of Composer\Repository\PearRepository.

src/Composer/Repository/PearRepository.php

@@ -131,15 +131,17 @@ class PearRepository extends ArrayRepository
      */
     private function parseVersion(array $data)
     {
+        if (!isset($data['min']) && !isset($data['max'])) {
+            return '*';
+        }
+        $versions = array();
         if (isset($data['min'])) {
-            $version = '>=' . $data['min'];
+            $versions[] = '>=' . $data['min'];
-        } else {
-            $version = '>=0.0.0';
         }
         if (isset($data['max'])) {
-            $version .= ',<=' . $data['max'];
+            $versions[] = '<=' . $data['max'];
         }
-        return $version;
+        return implode(',', $versions);
     }
 
     /**
@@ -165,6 +167,7 @@ class PearRepository extends ArrayRepository
                 }
             }
         }
+        var_dump($data);die;
         return $data;
     }