# Work in extended mode (default).
	#
	# Behavior changes when using extended mode:
	#
	# * Lists and code blocks end a paragraph
	#
	#   In normal markdown the following:
	#
	# ~~~md
	# This is a paragraph
	# * and this is not a list
	# ~~~
	#
	#   Will produce:
	#
	# ~~~html
	# <p>This is a paragraph
	# * and this is not a list</p>
	# ~~~
	#
	#   When using extended mode this changes to:
	#
	# ~~~html
	# <p>This is a paragraph</p>
	# <ul>
	# <li>and this is not a list</li>
	# </ul>
	# ~~~
	#
	# * Fences code blocks
	#
	#   If you don't want to indent your all your code with 4 spaces,
	#   you can wrap your code in ``` ``` ``` or `~~~`.
	#
	#   Here's an example:
	#
	# ~~~md
	# fun test do
	#    print "Hello World!"
	# end
	# ~~~
	#
	# * Code blocks meta
	#
	#   If you want to use syntax highlighting tools, most of them need to know what kind
	#   of language they are highlighting.
	#   You can add an optional language identifier after the fence declaration to output
	#   it in the HTML render.
	#
	# ```nit
	# import markdown
	#
	# print "# Hello World!".md_to_html
	# ```
	#
	#   Becomes
	#
	# ~~~html
	# <pre class="nit"><code>import markdown
	#
	# print "Hello World!".md_to_html
	# </code></pre>
	# ~~~
	#
	# * Underscores (Emphasis)
	#
	#   Underscores in the middle of a word like:
	#
	# ~~~md
	# Con_cat_this
	# ~~~
	#
	#   normally produces this:
	#
	# ~~~html
	# <p>Con<em>cat</em>this</p>
	# ~~~
	#
	#   With extended mode they don't result in emphasis.
	#
	# ~~~html
	# <p>Con_cat_this</p>
	# ~~~
	#
	# * Strikethrough
	#
	#   Like in [GFM](https://help.github.com/articles/github-flavored-markdown),
	#   strikethrought span is marked with `~~`.
	#
	# ~~~md
	# ~~Mistaken text.~~
	# ~~~
	#
	#   becomes
	#
	# ~~~html
	# <del>Mistaken text.</del>
	# ~~~
	var ext_mode = true