ipynb reader: avoid introducing spurious .0 on integers in metadata.

pandoc.cabal

@@ -375,6 +375,7 @@ library
                  random >= 1 && < 1.2,
                  pandoc-types >= 1.17.5 && < 1.18,
                  aeson >= 0.7 && < 1.5,
+                 scientific >= 0.3 && < 0.4,
                  aeson-pretty >= 0.8.5 && < 0.9,
                  tagsoup >= 0.14.6 && < 0.15,
                  base64-bytestring >= 0.1 && < 1.1,

src/Text/Pandoc/Readers/Ipynb.hs

@@ -23,6 +23,7 @@ import Data.List (isPrefixOf)
 import Data.Maybe (fromMaybe)
 import Data.Digest.Pure.SHA (sha1, showDigest)
 import Text.Pandoc.Options
+import qualified Data.Scientific as Scientific
 import qualified Text.Pandoc.Builder as B
 import Text.Pandoc.Logging
 import Text.Pandoc.Definition
@@ -209,7 +210,9 @@ jsonMetaToMeta = M.mapKeys T.unpack . M.map valueToMetaValue
         Success xs -> MetaList $ map valueToMetaValue xs
     valueToMetaValue (Bool b) = MetaBool b
     valueToMetaValue (String t) = MetaString (T.unpack t)
-    valueToMetaValue (Number n) = MetaString (show n)
+    valueToMetaValue (Number n)
+      | Scientific.isInteger n = MetaString (show (floor n :: Integer))
+      | otherwise              = MetaString (show n)
     valueToMetaValue Aeson.Null = MetaString ""
 
 jsonMetaToPairs :: JSONMeta -> [(String, String)]