Module:Yesno

-- Function allowing for consistent treatment of boolean-like wikitext input.
-- It works similarly to the template .
return function (val, default)
 val = type(val) == 'string' and mw.ustring.lower(val) or val -- put in lower case
 if val == nil then
 return nil
 elseif val == false or val == 'no' or val == 'n' or val == 'false' or tonumber(val) == 0 then
 return false
 elseif val == true or val == 'yes' or val == 'y' or val == 'true' or tonumber(val) == 1 then
 return true
 else
 return default
 end
end