Use direct comparison to check data type consistency during Tablet.addValue

[ColinLeeo]

Before

After

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.87%. Comparing base (0b286ad) to head (db38d9a).
⚠️ Report is 33 commits behind head on develop.

Files with missing lines	Patch %	Lines
cpp/src/common/tablet.cc	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@## develop #678 +/- ##
===========================================
- Coverage 61.89% 61.87% -0.03% 
===========================================
Files 709 709 Lines 40176 40197 +21 Branches 5650 5653 +3 ===========================================
+ Hits 24867 24871 +4 - Misses 14608 14628 +20 + Partials 701 698 -3 

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