Performance fix (#153)

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #159 into master will increase coverage by 0.16%.
The diff coverage is 83.58%.

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   82.38%   82.55%   +0.16%     
==========================================
  Files          36       37       +1     
  Lines        3520     3542      +22     
  Branches      489      489              
==========================================
+ Hits         2900     2924      +24     
+ Misses        481      480       -1     
+ Partials      139      138       -1

Impacted Files	Coverage Δ
.../System.Linq.Dynamic.Core/Parser/KeywordsHelper.cs	97.56% <100%> (ø)	⬆️
...ystem.Linq.Dynamic.Core/Parser/ExpressionParser.cs	77.33% <100%> (-0.08%)	⬇️
...tem.Linq.Dynamic.Core/ParameterExpressionHelper.cs	100% <100%> (ø)
....Linq.Dynamic.Core/Parser/PredefinedTypesHelper.cs	95.45% <100%> (+20.45%)	⬆️
...em.Linq.Dynamic.Core/DynamicQueryableExtensions.cs	98.3% <100%> (ø)	⬆️
...ystem.Linq.Dynamic.Core/DynamicExpressionParser.cs	70.37% <59.25%> (-16%)	⬇️

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