Fix big bit column typecasting

[Tigrov]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	#369

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.67%. Comparing base (0d6da65) to head (bac8ebd).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Column/BitColumnInternal.php	93.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #456      +/-   ##
============================================
- Coverage     99.77%   99.67%   -0.11%     
- Complexity      306      316      +10     
============================================
  Files            34       36       +2     
  Lines           905      919      +14     
============================================
+ Hits            903      916      +13     
- Misses            2        3       +1     

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