optimise checkType by reducing function calls

[ntzm]

Before, adding 5 million elements:

Object performance
Time: 5.3127160072327
Scalar performance
Time: 5.2646420001984

After, adding 5 million elements:

Object performance
Time: 4.6362578868866
Scalar performance
Time: 3.9720978736877

[coveralls]

Pull Request Test Coverage Report for Build 58

• 8 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 53:	0.0%
Covered Lines:	238
Relevant Lines:	238

---

💛 - Coveralls

[qlty-cloud-legacy]

Code Climate has analyzed commit 5a662b5 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

View more on Code Climate.

[Antnee]

Nice work, thanks!