Add: invalidDiscriminatorValue method
Fix: handle invalid discriminator value
[DDC-3076] Add test
[DDC-3076] Fix ObjectHydrator
[DDC-3076] Add/Improve tests
Merge pull request #1006 from Trainmaster/master

Handling invalid discriminator values
Single quotes can't nest

I decided to use "... '...' ...", but perhaps you prefer '... \'...\' ...'?
Merge pull request #1011 from md2perpe/patch-2

Single quotes can't nest