Remove dynamic keyword

[humhei]

fixes #138

[Horusiath]

Hi @humhei. Did you run actual benchmarks? We know that a single run can take time, but DLR specialization can speedup things on subsequent runs (that's precisely why dynamic is used there). Things like this, code warmups and many more are reasons why we should use tools like BenchmarkDotNet not the test explorer. Before merging, this needs a verification.

[humhei]

It's may be my fault,
I misunderstand that dynamic will recompile every time when geneirc type T changed,
But it seems it only compile one time
even though generic type changed, it never compile again

I encounter this issue when i programming in UI side,

It have a obvious Pause after i send message to server at first time
Maybe i can solve this problem by warmup int [] first

[Aaronontheweb]

@Arkatufus in light of the changes made to #235, this PR should probably be safe right? Performs the same cleanup in one more spot.

[Arkatufus]

Casting an object directly to Array might cause a problem with ValueType arrays, let me do a quick test first.

[Arkatufus]

Code is good, tested it and it works.