Constructors that accept a block do not render correctly

[Blacksmoke16]

Given the code:

class Athena::Validator::Foo
  def self.new(v : Int32 = 1)
    new ->{ v }
  end

  def initialize(&@callback : -> Int32); end
end

crystal docs would render:

While via mkdocs renders:

Not sure if its related, but it seems there also some extra whitespace after the method names?