Override dataclass constructor to improve performance

[wyfo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #295 (c2c4aee) into master (4e19709) will increase coverage by 0.06%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   85.48%   85.55%   +0.06%     
==========================================
  Files          65       65              
  Lines        5609     5654      +45     
  Branches     1153     1167      +14     
==========================================
+ Hits         4795     4837      +42     
  Misses        598      598              
- Partials      216      219       +3     

Impacted Files	Coverage Δ
apischema/deserialization/methods.py	85.10% <93.02%> (+0.44%)	⬆️
apischema/deserialization/__init__.py	98.87% <100.00%> (+0.02%)	⬆️
apischema/settings.py	91.66% <100.00%> (+0.10%)	⬆️

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