[TASK] Add type declarations for OutputFormat::indentWith*

Also improve the naming of the parameters.

Author: oliverklee

CHANGELOG.md

@@ -21,7 +21,7 @@ Please also have a look at our
 ### Changed
 
 - Use more native type declarations and strict mode
-  (#641, #772, #774, #778, #804, #841)
+  (#641, #772, #774, #778, #804, #841, #783)
 - Add visibility to all class/interface constants (#469)
 
 ### Deprecated

src/OutputFormat.php

@@ -243,23 +243,19 @@ public function __call(string $sMethodName, array $aArguments)
     }
 
     /**
-     * @param int $iNumber
-     *
-     * @return self
+     * @return $this fluent interface
      */
-    public function indentWithTabs($iNumber = 1)
+    public function indentWithTabs(int $numberOfTabs = 1): self
     {
-        return $this->setIndentation(\str_repeat("\t", $iNumber));
+        return $this->setIndentation(\str_repeat("\t", $numberOfTabs));
     }
 
     /**
-     * @param int $iNumber
-     *
-     * @return self
+     * @return $this fluent interface
      */
-    public function indentWithSpaces($iNumber = 2)
+    public function indentWithSpaces(int $numberOfSpaces = 2): self
     {
-        return $this->setIndentation(\str_repeat(' ', $iNumber));
+        return $this->setIndentation(\str_repeat(' ', $numberOfSpaces));
     }
 
     /**