faster handling of _filled attribute and parent

[orso82]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.60656% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.73%. Comparing base (046a8e6) to head (b9b8595).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/data.jl	83.05%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   43.68%   43.73%   +0.05%     
==========================================
  Files          14       14              
  Lines       31250    31251       +1     
==========================================
+ Hits        13650    13669      +19     
+ Misses      17600    17582      -18     

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