Add test for type loose for array and update doc for behavior

[justin-tay]

Closes #415

Add test for type validator type loose behavior for arrays and update documentation accordingly that type loose will interpret an item as an array of size 1 and that it will then only validate that that item matches the type defined for the array.

Not sure if there is supposed to be a spec which defines what type loose behavior is supposed to be.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c7e7ab4) 78.81% compared to head (ad9d785) 78.92%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #946      +/-   ##
============================================
+ Coverage     78.81%   78.92%   +0.10%     
- Complexity     1694     1699       +5     
============================================
  Files           157      157              
  Lines          5669     5669              
  Branches       1071     1071              
============================================
+ Hits           4468     4474       +6     
+ Misses          799      796       -3     
+ Partials        402      399       -3     

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[stevehu]

@justin-tay Type-loose is not a concept in the specification but an extra feature in the library. This was introduced to validate incoming requests against the OpenAPI specifications. In HTTP requests, headers, query and path parameters don't have type information.