Ensure / can be escaped when blocks is registered

docs/src/markdown/about/changelog.md

@@ -7,6 +7,7 @@
 - **NEW**: Add temporary alpha/beta option `yaml_indent` to control whether per-block YAML configs use indentation or a
   leading special character: `/` for `///` syntax and `:` for `:::` syntax (`colon_syntax` must be true to use `:::`
   syntax).
+- **NEW**: Ensure that `/` character can be escaped when registering the `blocks` extension.
 - **FIX**: Fix some block nesting issues.
 
 ## 9.10a1

pymdownx/blocks/__init__.py

@@ -2,6 +2,7 @@
 from markdown import Extension
 from markdown.blockprocessors import BlockProcessor
 from markdown import util as mutil
+from .. import util
 import xml.etree.ElementTree as etree
 import re
 from .admonition import Admonition
@@ -480,6 +481,7 @@ def extendMarkdown(self, md):
         """Add Blocks to Markdown instance."""
 
         md.registerExtension(self)
+        util.escape_chars(md, ['/'])
 
         config = self.getConfigs()
         self.extension = BlocksProcessor(md.parser, md, config)