Add a test file working on numbers.

drop/Base64.purs

@@ -0,0 +1,14 @@
+module Base64 where
+
+import Prelude (($), (+), (/), (-))
+import Data.Int (toNumber, floor)
+import Data.Number ((%))
+
+datasize2b64size :: Int -> Int
+datasize2b64size v =
+  let x = toNumber v
+      remainder = x % 24.0
+      additional_chars = (x / 24.0) + (32.0 - remainder) / 8.0
+      base = x / 8.0
+  in floor $ base + additional_chars
+