Make performance comparison fairer

The Intl tests avoided one mission user-function calls by doing a simple
loop, something unlikely to be used in real-world situations; wrapping
the test in a generator adds the overhead one would expect to have,
making the pure PHP implementation much more competitive

RoboFile.php

@@ -2,11 +2,6 @@
 
 use Robo\Result;
 
-/**
- * This is project's console commands configuration for Robo task runner.
- *
- * @see http://robo.li/
- */
 class RoboFile extends \Robo\Tasks {
     const BASE = __DIR__.\DIRECTORY_SEPARATOR;
     const BASE_TEST = self::BASE."tests".\DIRECTORY_SEPARATOR;
@@ -47,12 +42,12 @@ class RoboFile extends \Robo\Tasks {
     /** Produces a code coverage report
      *
      * By default this task produces an HTML-format coverage report in
-     * arsse/tests/coverage/. Additional reports may be produced by passing
+     * tests/coverage/. Additional reports may be produced by passing
      * arguments to this task as one would to PHPUnit.
      *
      * Robo first tries to use phpdbg and will fall back to Xdebug if available.
      * Because Xdebug slows down non-coverage tasks, however, phpdbg is highly
-     * recommanded is debugging facilities are not otherwise needed.
+     * recommended if debugging facilities are not otherwise needed.
     */
     public function coverage(array $args): Result {
         // run tests with code coverage reporting enabled

perf/perf.php

@@ -17,10 +17,15 @@ $files = [
 
 $tests = [
     'Intl characters' => ["intl", function(string $text) {
-        $i = \IntlBreakIterator::createCodePointInstance();
+        $i = (function($text) {
-        $i->setText($text);
+            $i = \IntlBreakIterator::createCodePointInstance();
-        foreach ($i as $b) {
+            $i->setText($text);
-            \IntlChar::chr($i->getLastCodePoint());
+            foreach ($i as $b) {
+                yield \IntlChar::chr($i->getLastCodePoint());
+            }
+        })($text);
+        foreach ($i as $c) {
+            $b = $c;
         }
     }],
     'Native characters (obj)' => ["", function(string $text) {
@@ -36,10 +41,15 @@ $tests = [
         }
     }],
     'Intl code points' => ["intl", function(string $text) {
-        $i = \IntlBreakIterator::createCodePointInstance();
+        $i = (function($text) {
-        $i->setText($text);
+            $i = \IntlBreakIterator::createCodePointInstance();
-        foreach ($i as $b) {
+            $i->setText($text);
-            $i->getLastCodePoint();
+            foreach ($i as $b) {
+                yield $i->getLastCodePoint();
+            }
+        })($text);
+        foreach ($i as $c) {
+            $b = $c;
         }
     }],
     'Native code points (obj)' => ["", function(string $text) {