Tabs shouldn't break thematic breaks

src/Components/Blocks/Rule.php

@@ -30,7 +30,10 @@ final class Rule implements Block
 
         $marker = $Context->line()->text()[0];
 
-        if (\substr_count($Context->line()->text(), $marker) >= 3 and \chop($Context->line()->text(), " $marker") === '') {
+        if (
+            \substr_count($Context->line()->text(), $marker) >= 3
+            and \chop($Context->line()->text(), " \t$marker") === ''
+        ) {
             return new self;
         }
 

tests/data/horizontal_rule.html

@@ -5,3 +5,4 @@
 <hr />
 <p>foo
 ***</p>
+<hr />

tests/data/horizontal_rule.md

@@ -10,3 +10,5 @@ ___
 
 foo
     ***
+
+*	*	*