diff --git a/hrfsize.cabal b/hrfsize.cabal
--- a/hrfsize.cabal
+++ b/hrfsize.cabal
@@ -1,7 +1,7 @@
 cabal-version: 1.12
 
 name:           hrfsize
-version:        0.0.1
+version:        0.0.2
 description:    Simple Haskell library for determining size of file in human readable format
 synopsis:       File size in human readable format
 homepage:       https://github.com/librerush/hrfsize#readme
diff --git a/src/System/HrfSize.hs b/src/System/HrfSize.hs
--- a/src/System/HrfSize.hs
+++ b/src/System/HrfSize.hs
@@ -8,8 +8,12 @@
                             withBinaryFile)
 
 -- | IEC standard
-data FileSize = Bytes Double | KiB Double | MiB Double
-              | GiB Double | TiB Double
+data FileSize
+  = Bytes !Double
+  | KiB   !Double
+  | MiB   !Double
+  | GiB   !Double
+  | TiB   !Double
   deriving (Show, Eq, Ord)
 
 convertSize :: Double -> FileSize
diff --git a/stack.yaml b/stack.yaml
deleted file mode 100644
--- a/stack.yaml
+++ /dev/null
@@ -1,64 +0,0 @@
-# This file was automatically generated by 'stack init'
-#
-# Some commonly used options have been documented as comments in this file.
-# For advanced use and comprehensive documentation of the format, please see:
-# https://docs.haskellstack.org/en/stable/yaml_configuration/
-
-# Resolver to choose a 'specific' stackage snapshot or a compiler version.
-# A snapshot resolver dictates the compiler version and the set of packages
-# to be used for project dependencies. For example:
-#
-# resolver: lts-3.5
-# resolver: nightly-2015-09-21
-# resolver: ghc-7.10.2
-#
-# The location of a snapshot can be provided as a file or url. Stack assumes
-# a snapshot provided as a file might change, whereas a url resource does not.
-#
-# resolver: ./custom-snapshot.yaml
-# resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-13.21
-
-# User packages to be built.
-# Various formats can be used as shown in the example below.
-#
-# packages:
-# - some-directory
-# - https://example.com/foo/bar/baz-0.0.2.tar.gz
-# - location:
-#    git: https://github.com/commercialhaskell/stack.git
-#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
-# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
-#  subdirs:
-#  - auto-update
-#  - wai
-packages:
-- .
-# Dependency packages to be pulled from upstream that are not in the resolver
-# using the same syntax as the packages field.
-# (e.g., acme-missiles-0.3)
-# extra-deps: []
-
-# Override default flag values for local packages and extra-deps
-# flags: {}
-
-# Extra package databases containing global packages
-# extra-package-dbs: []
-
-# Control whether we use the GHC we find on the path
-# system-ghc: true
-#
-# Require a specific version of stack, using version ranges
-# require-stack-version: -any # Default
-# require-stack-version: ">=1.9"
-#
-# Override the architecture used by stack, especially useful on Windows
-# arch: i386
-# arch: x86_64
-#
-# Extra directories used by stack for building
-# extra-include-dirs: [/path/to/dir]
-# extra-lib-dirs: [/path/to/dir]
-#
-# Allow a newer minor version of GHC than the snapshot specifies
-# compiler-check: newer-minor
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -1,19 +1,6 @@
-import           System.HrfSize
-import           Test.Tasty
-import           Test.Tasty.HUnit
+-- import           System.HrfSize
+-- import           Test.Tasty
+-- import           Test.Tasty.HUnit
 
 main :: IO ()
-main = do
-  f1 <- determineFileSize "/tmp/file1"
-  f2 <- determineFileSize "/tmp/file2"
-  defaultMain (tests [f1, f2])
-
--- | Creating files using
--- `head -c size /dev/urandom > /tmp/fileN`
-tests :: [FileSize] -> TestTree
-tests files = testGroup "determineFileSize"
-  [ testCase "file1" $
-      MiB 1.95 @?= head files
-  , testCase "file2" $
-      Bytes 99.0 @?= head (tail files)
-  ]
+main = putStrLn "Not yet implemented"