Only complete pointer paths now considered intersecting

[XedinUnknown]

This fixes halaxa/json-machine#106 by adding a path separator to terminate each pointer when comparing for intersection.

[mad-briller]

i ran into this issue recently and this would be a great change if it works as anticipated

however the tests in this PR only test the outcome of the validator and not the actual parser when used with intersecting pointers, perhaps that would be a good thing to also test?

it may be that the algorithm simply will not handle intersection of any type in the keys i'm not super knowledgable on the parser itself and assume you have done some testing of the outcome locally however?

[XedinUnknown]

Hi @mad-briller! I've done testing, sure, and it works for me in a project.

Regarding parser testing, I'm not sure if it's actually a part of the parser's concern. But if it is, I'm also not that knowledgeable about parsers. In fact, there are #105 and #108 that would need someone with parser experience to fix. If you'd like, I can give you write access to the repo with the fix, and feel free to add more tests.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1b3aa89) 100.00% compared to head (1581575) 100.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #107 +/- ## =========================================== Coverage 100.00% 100.00% Complexity 184 184 =========================================== Files 17 17 Lines 526 526 =========================================== Hits 526 526 ```

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