> blockquote with no whitespace before `>`.
foo
> blockquote with one space before the `>`.
bar
> blockquote with 2 spaces.
baz
> this has three spaces so its a paragraph.
blah
> this one had four so it's a code block.
> > this nested blockquote has 0 on level one and 3 (one after the first `>` + 2 more) on level 2.
> > and this has 4 on level 2 - another code block.