Remove always true/false occurrences

Author: alexandre-daubois

Diff for: Tests/Inflector/SpanishInflectorTest.php

@@ -151,7 +151,7 @@ public function testPluralize(string $singular, $plural)
     public function testUninflected(string $word)
     {
         $this->assertSame(
-            \is_array($word) ? $word : [$word],
+            [$word],
             (new SpanishInflector())->pluralize($word)
         );
     }

Diff for: UnicodeString.php

@@ -286,7 +286,7 @@ public function splice(string $replacement, int $start = 0, ?int $length = null)
         $str = clone $this;
 
         $start = $start ? \strlen(grapheme_substr($this->string, 0, $start)) : 0;
-        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length ?? 2147483647)) : $length;
+        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length)) : $length;
         $str->string = substr_replace($this->string, $replacement, $start, $length ?? 2147483647);
 
         if (normalizer_is_normalized($str->string)) {