Treat '0' as a legitimate trim char

Because of a loose comparison, it was not.

Author: greg0ire

src/Query/AST/Functions/TrimFunction.php

@@ -74,7 +74,7 @@ public function parse(Parser $parser)
             $this->trimChar = $lexer->token->value;
         }
 
-        if ($this->leading || $this->trailing || $this->both || $this->trimChar) {
+        if ($this->leading || $this->trailing || $this->both || ($this->trimChar !== false)) {
             $parser->match(Lexer::T_FROM);
         }
 

tests/Tests/ORM/Query/LanguageRecognitionTest.php

@@ -172,6 +172,11 @@ public function testFunctionalExpressionsSupportedInWherePart(): void
         $this->assertValidDQL("SELECT u.name FROM Doctrine\Tests\Models\CMS\CmsUser u WHERE TRIM(u.name) = 'someone'");
     }
 
+    public function testTrimFalsyString(): void
+    {
+        $this->assertValidDQL("SELECT u.name FROM Doctrine\Tests\Models\CMS\CmsUser u WHERE TRIM('0' FROM u.name) = 'someone'");
+    }
+
     public function testArithmeticExpressionsSupportedInWherePart(): void
     {
         $this->assertValidDQL('SELECT u FROM Doctrine\Tests\Models\CMS\CmsUser u WHERE ((u.id + 5000) * u.id + 3) < 10000000');