fix roundtrip of Tuple{Type{Int}}

[JonasIsensee]

closes #484

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (2f9b17e) 85.94% compared to head (96459fd) 85.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #485   +/-   ##
=======================================
  Coverage   85.94%   85.94%           
=======================================
  Files          31       31           
  Lines        4227     4227           
=======================================
  Hits         3633     3633           
  Misses        594      594           

Files Changed	Coverage Δ
src/data/writing_datatypes.jl	96.55% <100.00%> (ø)

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