Use strict equality for comparing properties

[pepijndevos]

We found that for really large tuples the Julia compiler would give up on constfolding the comparison leading to a runtime check. Tuples of symbols are === so this change makes it easier for the compiler to inline.

[jw3126]

Awesome thanks! Can you provide a test case? If this is too hard, please add a comment, why the === is important and link this PR.

[jw3126]

Also there might be other places, where we should use === not sure. Not suggesting you have to vet the codebase for this PR, but would be awesome.

[pepijndevos]

Yeah it's kind of hard to write a test for I guess since it only changes the compiler optimization and not the functionality.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 25.49%. Comparing base (8e3e773) to head (b25fef5).

Files	Patch %	Lines
src/ConstructionBase.jl	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #82 +/- ## ======================================= Coverage 25.49% 25.49% ======================================= Files 5 5 Lines 153 153 ======================================= Hits 39 39 Misses 114 114 ```

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[pepijndevos]

From a quick search for == and != it could indeed be that the case in tuple_or_ntuple could also be === but I'm not that familiar with this package so I'll leave that for now. For this PR I have at least strong evidence that it works and improves performance in our code.

[jw3126]

Thanks! If you bump the patch version I can release after merge.

[pepijndevos]

Sweet