2 files changed, 18 insertions, 2 deletions
diff --git a/src/Text/Pandoc/Lua/StackInstances.hs b/src/Text/Pandoc/Lua/StackInstances.hs
index da9c33183..15a7cdd84 100644
--- a/src/Text/Pandoc/Lua/StackInstances.hs
+++ b/src/Text/Pandoc/Lua/StackInstances.hs
@@ -33,8 +33,8 @@ StackValue instances for pandoc types.
 module Text.Pandoc.Lua.StackInstances () where
 
 import Control.Applicative ((<|>))
-import Foreign.Lua (Lua, Type (..), FromLuaStack (peek), ToLuaStack (push),
-                    StackIndex, throwLuaError, tryLua)
+import Foreign.Lua (Lua, LuaInteger, LuaNumber, Type (..), FromLuaStack (peek),
+                    ToLuaStack (push), StackIndex, throwLuaError, tryLua)
 import Foreign.Lua.Api (getmetatable, ltype, newtable, pop, rawget, rawlen)
 import Text.Pandoc.Definition
 import Text.Pandoc.Lua.Util (addValue, adjustIndexBy, getTable, pushViaConstructor)
@@ -125,6 +125,16 @@ instance ToLuaStack QuoteType where
 instance FromLuaStack QuoteType where
   peek idx = safeRead' =<< peek idx
 
+instance ToLuaStack Double where
+  push = push . (realToFrac :: Double -> LuaNumber)
+instance FromLuaStack Double where
+  peek = fmap (realToFrac :: LuaNumber -> Double) . peek
+
+instance ToLuaStack Int where
+  push = push . (fromIntegral :: Int -> LuaInteger)
+instance FromLuaStack Int where
+  peek = fmap (fromIntegral :: LuaInteger-> Int) . peek
+
 safeRead' :: Read a => String -> Lua a
 safeRead' s = case safeRead s of
   Nothing -> throwLuaError ("Could not read: " ++ s)
diff --git a/src/Text/Pandoc/Writers/Custom.hs b/src/Text/Pandoc/Writers/Custom.hs
index 63725bb60..d7dff6d19 100644
--- a/src/Text/Pandoc/Writers/Custom.hs
+++ b/src/Text/Pandoc/Writers/Custom.hs
@@ -60,6 +60,12 @@ attrToMap (id',classes,keyvals) = M.fromList
     : ("class", unwords classes)
     : keyvals
 
+instance ToLuaStack Double where
+  push = push . (realToFrac :: Double -> LuaNumber)
+
+instance ToLuaStack Int where
+  push = push . (fromIntegral :: Int -> LuaInteger)
+
 instance ToLuaStack Format where
   push (Format f) = push (map toLower f)