Improve typeof invocation when parsing

[stockiNail]

The typeof was invoked twice in the parse method, to check if undefined (in if statement) and later to get the type.
Moved before consistency check in order to invoke only one when the value argument is not null.

[coveralls]

Pull Request Test Coverage Report for Build 2668870414

• 0 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 72.727%

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Files with Coverage Reduction	New Missed Lines	%
src/index.js	2	72.73%

Totals
Change from base Build 2085427674:	0.0%
Covered Lines:	24
Relevant Lines:	31

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 2668870414

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 72.727%

---

Files with Coverage Reduction	New Missed Lines	%
src/index.js	2	72.73%

Totals
Change from base Build 2085427674:	0.0%
Covered Lines:	24
Relevant Lines:	31

---

💛 - Coveralls