Editing Module:Yesno

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@@ Line 1: / Line 1: @@
--- Function allowing for consistent treatment of boolean-like wikitext input.
--- It works similarly to the template {{yesno}}.
-return function (val, default)
-	-- If your wiki uses non-ascii characters for any of "yes", "no", etc., you
-	-- should replace "val:lower()" with "mw.ustring.lower(val)" in the
-	-- following line.
-	val = type(val) == 'string' and val:lower() or val
-	if val == nil then
-		return nil
-	elseif val == true
-		or val == 'yes'
-		or val == 'y'
-		or val == 'true'
-		or val == 't'
-		or val == 'on'
-		or tonumber(val) == 1
-	then
-		return true
-	elseif val == false
-		or val == 'no'
-		or val == 'n'
-		or val == 'false'
-		or val == 'f'
-		or val == 'off'
-		or tonumber(val) == 0
-	then
-		return false
-	else
-		return default
-	end
-end