refactor: check for different dtypes in nan transformer

[chrislemke]

No description provided.

[codecov]

Codecov Report

Merging #72 (f3b496e) into develop (3983446) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #72      +/-   ##
===========================================
+ Coverage    99.36%   99.41%   +0.05%     
===========================================
  Files            9        9              
  Lines          469      517      +48     
===========================================
+ Hits           466      514      +48     
  Misses           3        3              

Impacted Files	Coverage Δ
src/sk_transformers/__init__.py	100.00% <ø> (ø)
src/sk_transformers/deep_transformer.py	100.00% <ø> (ø)
src/sk_transformers/number_transformer.py	100.00% <ø> (ø)
src/sk_transformers/datetime_transformer.py	100.00% <100.00%> (ø)
src/sk_transformers/generic_transformer.py	99.37% <100.00%> (+0.02%)	⬆️
src/sk_transformers/string_transformer.py	98.37% <100.00%> (ø)
src/sk_transformers/utils.py	100.00% <100.00%> (ø)

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