Implement the ability for user-defined type casting

[Tigrov]

Related PR

• Implement the ability for user-defined type casting db#941

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.18%. Comparing base (248708f) to head (9ba2de7).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #351      +/-   ##
============================================
+ Coverage     98.17%   98.18%   +0.01%     
  Complexity      230      230              
============================================
  Files            20       20              
  Lines           711      715       +4     
============================================
+ Hits            698      702       +4     
  Misses           13       13              

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